656551140564 has 72 divisors (see below), whose sum is σ = 1684040914080. Its totient is φ = 198936098240.

The previous prime is 656551140563. The next prime is 656551140571. The reversal of 656551140564 is 465041155656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656551140563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28126642 + ... + 28149974.

It is an arithmetic number, because the mean of its divisors is an integer number (23389457140).

Almost surely, 2^656551140564 is an apocalyptic number.

It is an amenable number.

656551140564 is an abundant number, since it is smaller than the sum of its proper divisors (1027489773516).

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

656551140564 is a wasteful number, since it uses less digits than its factorization.

656551140564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42741 (or 42728 counting only the distinct ones).

The product of its (nonzero) digits is 2160000, while the sum is 48.

The spelling of 656551140564 in words is "six hundred fifty-six billion, five hundred fifty-one million, one hundred forty thousand, five hundred sixty-four".