256506550260 has 48 divisors (see below), whose sum is σ = 721354704000. Its totient is φ = 68103045504.

The previous prime is 256506550249. The next prime is 256506550337. The reversal of 256506550260 is 62055605652.

It is a super-2 number, since 2×256506550260² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9320560 + ... + 9348039.

It is an arithmetic number, because the mean of its divisors is an integer number (15028223000).

Almost surely, 2^256506550260 is an apocalyptic number.

256506550260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256506550260 is an abundant number, since it is smaller than the sum of its proper divisors (464848153740).

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

256506550260 is a wasteful number, since it uses less digits than its factorization.

256506550260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18668840 (or 18668838 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 42.

The spelling of 256506550260 in words is "two hundred fifty-six billion, five hundred six million, five hundred fifty thousand, two hundred sixty".