656520631 has 8 divisors (see below), whose sum is σ = 709257024. Its totient is φ = 604103520.

The previous prime is 656520619. The next prime is 656520643. The reversal of 656520631 is 136025656.

It is an interprime number because it is at equal distance from previous prime (656520619) and next prime (656520643).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656520631 - 2²⁷ = 522302903 is a prime.

It is a super-2 number, since 2×656520631² = 862038677857276322, 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 (656520131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75535 + ... + 83776.

It is an arithmetic number, because the mean of its divisors is an integer number (88657128).

Almost surely, 2^656520631 is an apocalyptic number.

656520631 is a deficient number, since it is larger than the sum of its proper divisors (52736393).

656520631 is a wasteful number, since it uses less digits than its factorization.

656520631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159641.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 656520631 is about 25622.6585466848. The cubic root of 656520631 is about 869.1261013844.

The spelling of 656520631 in words is "six hundred fifty-six million, five hundred twenty thousand, six hundred thirty-one".