1663891067 has 2 divisors, whose sum is σ = 1663891068. Its totient is φ = 1663891066.

The previous prime is 1663891057. The next prime is 1663891111. The reversal of 1663891067 is 7601983661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (7601983661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1663891067 - 2²⁰ = 1662842491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1663891027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831945533 + 831945534.

It is an arithmetic number, because the mean of its divisors is an integer number (831945534).

Almost surely, 2^1663891067 is an apocalyptic number.

1663891067 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663891067 is an equidigital number, since it uses as much as digits as its factorization.

1663891067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 1663891067 is about 40790.8208669549. The cubic root of 1663891067 is about 1184.9725683384.

The spelling of 1663891067 in words is "one billion, six hundred sixty-three million, eight hundred ninety-one thousand, sixty-seven".