656560031320 has 32 divisors (see below), whose sum is σ = 1528200075600. Its totient is φ = 253568011648.

The previous prime is 656560031317. The next prime is 656560031401. The reversal of 656560031320 is 23130065656.

It is a self number, because there is not a number n which added to its sum of digits gives 656560031320.

It is a congruent number.

It is an unprimeable number.

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, 282998854 + ... + 283001173.

Almost surely, 2^656560031320 is an apocalyptic number.

It is an amenable number.

656560031320 is an abundant number, since it is smaller than the sum of its proper divisors (871640044280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656560031320 is a wasteful number, since it uses less digits than its factorization.

656560031320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566000067 (or 566000063 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 37.

Adding to 656560031320 its reverse (23130065656), we get a palindrome (679690096976).

The spelling of 656560031320 in words is "six hundred fifty-six billion, five hundred sixty million, thirty-one thousand, three hundred twenty".