256980002865 has 32 divisors (see below), whose sum is σ = 412447334400. Its totient is φ = 136629812160.

The previous prime is 256980002857. The next prime is 256980002887. The reversal of 256980002865 is 568200089652.

It is not a de Polignac number, because 256980002865 - 2³ = 256980002857 is a prime.

It is a super-4 number, since 4×256980002865⁴ (a number of 47 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22778296 + ... + 22789574.

It is an arithmetic number, because the mean of its divisors is an integer number (12888979200).

Almost surely, 2^256980002865 is an apocalyptic number.

It is an amenable number.

256980002865 is a deficient number, since it is larger than the sum of its proper divisors (155467331535).

256980002865 is a wasteful number, since it uses less digits than its factorization.

256980002865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15877.

The product of its (nonzero) digits is 2073600, while the sum is 51.

It can be divided in two parts, 25698000 and 2865, that added together give a triangular number (25700865 = T₇₁₆₉).

The spelling of 256980002865 in words is "two hundred fifty-six billion, nine hundred eighty million, two thousand, eight hundred sixty-five".