656633493 has 16 divisors (see below), whose sum is σ = 974678400. Its totient is φ = 436906080.

The previous prime is 656633473. The next prime is 656633507. The reversal of 656633493 is 394336656.

656633493 is a `hidden beast` number, since 6 + 5 + 6 + 633 + 4 + 9 + 3 = 666.

It is not a de Polignac number, because 656633493 - 2¹⁰ = 656632469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656633423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9273 + ... + 37406.

It is an arithmetic number, because the mean of its divisors is an integer number (60917400).

Almost surely, 2^656633493 is an apocalyptic number.

It is an amenable number.

656633493 is a deficient number, since it is larger than the sum of its proper divisors (318044907).

656633493 is a wasteful number, since it uses less digits than its factorization.

656633493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47209 (or 47203 counting only the distinct ones).

The product of its digits is 1049760, while the sum is 45.

The square root of 656633493 is about 25624.8608386465. The cubic root of 656633493 is about 869.1759021497.

The spelling of 656633493 in words is "six hundred fifty-six million, six hundred thirty-three thousand, four hundred ninety-three".