656051651604 has 36 divisors (see below), whose sum is σ = 1658418352500. Its totient is φ = 218675237760.

The previous prime is 656051651581. The next prime is 656051651611. The reversal of 656051651604 is 406156150656.

656051651604 is a `hidden beast` number, since 65 + 60 + 5 + 16 + 516 + 0 + 4 = 666.

656051651604 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 431136692100 + 224914959504 = 656610^2 + 474252^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 656051651604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 597834 + ... + 1292094.

Almost surely, 2^656051651604 is an apocalyptic number.

It is an amenable number.

656051651604 is an abundant number, since it is smaller than the sum of its proper divisors (1002366700896).

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

656051651604 is a wasteful number, since it uses less digits than its factorization.

656051651604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720520 (or 720515 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 656051651604 in words is "six hundred fifty-six billion, fifty-one million, six hundred fifty-one thousand, six hundred four".