256901516456 has 16 divisors (see below), whose sum is σ = 518743446900. Its totient is φ = 118569930624.

The previous prime is 256901516441. The next prime is 256901516479. The reversal of 256901516456 is 654615109652.

It can be written as a sum of positive squares in 2 ways, for example, as 248831368900 + 8070147556 = 498830^2 + 89834^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1235103341 + ... + 1235103548.

Almost surely, 2^256901516456 is an apocalyptic number.

256901516456 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

256901516456 is an abundant number, since it is smaller than the sum of its proper divisors (261841930444).

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

256901516456 is a wasteful number, since it uses less digits than its factorization.

256901516456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470206908 (or 2470206904 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 50.

The spelling of 256901516456 in words is "two hundred fifty-six billion, nine hundred one million, five hundred sixteen thousand, four hundred fifty-six".