656121260512 has 48 divisors (see below), whose sum is σ = 1334603716992. Its totient is φ = 317193269760.

The previous prime is 656121260507. The next prime is 656121260527. The reversal of 656121260512 is 215062121656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 811998 + ... + 1404130.

It is an arithmetic number, because the mean of its divisors is an integer number (27804244104).

Almost surely, 2^656121260512 is an apocalyptic number.

656121260512 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656121260512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (667301858496).

656121260512 is an abundant number, since it is smaller than the sum of its proper divisors (678482456480).

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

656121260512 is a wasteful number, since it uses less digits than its factorization.

656121260512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593291 (or 593283 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 656121260512 in words is "six hundred fifty-six billion, one hundred twenty-one million, two hundred sixty thousand, five hundred twelve".