1663167493 has 4 divisors (see below), whose sum is σ = 1791103468. Its totient is φ = 1535231520.

The previous prime is 1663167491. The next prime is 1663167523. The reversal of 1663167493 is 3947613661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3947613661 = 29 ⋅136124609.

It can be written as a sum of positive squares in 2 ways, for example, as 931897729 + 731269764 = 30527^2 + 27042^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663167493 - 2¹ = 1663167491 is a prime.

It is a super-2 number, since 2×1663167493² = 5532252219543810098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663167491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63967968 + ... + 63967993.

It is an arithmetic number, because the mean of its divisors is an integer number (447775867).

Almost surely, 2^1663167493 is an apocalyptic number.

1663167493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1663167493 is a deficient number, since it is larger than the sum of its proper divisors (127935975).

1663167493 is a wasteful number, since it uses less digits than its factorization.

1663167493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127935974.

The product of its digits is 489888, while the sum is 46.

The square root of 1663167493 is about 40781.9505786567. The cubic root of 1663167493 is about 1184.8007743077.

The spelling of 1663167493 in words is "one billion, six hundred sixty-three million, one hundred sixty-seven thousand, four hundred ninety-three".