656117250720 has 96 divisors (see below), whose sum is σ = 2175546703680. Its totient is φ = 165755934720.

The previous prime is 656117250709. The next prime is 656117250721. The reversal of 656117250720 is 27052711656.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (656117250721) 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 15 ways as a sum of consecutive naturals, for example, 35962221 + ... + 35980460.

It is an arithmetic number, because the mean of its divisors is an integer number (22661944830).

Almost surely, 2^656117250720 is an apocalyptic number.

656117250720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656117250720 is an abundant number, since it is smaller than the sum of its proper divisors (1519429452960).

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

656117250720 is a wasteful number, since it uses less digits than its factorization.

656117250720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71942718 (or 71942710 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 656117250720 in words is "six hundred fifty-six billion, one hundred seventeen million, two hundred fifty thousand, seven hundred twenty".