256390236576 has 48 divisors (see below), whose sum is σ = 747804859200. Its totient is φ = 85463411904.

The previous prime is 256390236569. The next prime is 256390236581. The reversal of 256390236576 is 675632093652.

256390236576 is a `hidden beast` number, since 2 + 5 + 6 + 39 + 0 + 2 + 36 + 576 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×256390236576² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 148373116 + ... + 148374843.

It is an arithmetic number, because the mean of its divisors is an integer number (15579267900).

Almost surely, 2^256390236576 is an apocalyptic number.

It is an amenable number.

256390236576 is an abundant number, since it is smaller than the sum of its proper divisors (491414622624).

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

256390236576 is a wasteful number, since it uses less digits than its factorization.

256390236576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296747978 (or 296747964 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 54.

The spelling of 256390236576 in words is "two hundred fifty-six billion, three hundred ninety million, two hundred thirty-six thousand, five hundred seventy-six".