256617832218465 has 16 divisors (see below), whose sum is σ = 410807045980800. Its totient is φ = 136790005706112.

The previous prime is 256617832218457. The next prime is 256617832218497. The reversal of 256617832218465 is 564812238716652.

It is not a de Polignac number, because 256617832218465 - 2³ = 256617832218457 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 256617832218396 and 256617832218405.

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, 4552354860 + ... + 4552411229.

It is an arithmetic number, because the mean of its divisors is an integer number (25675440373800).

Almost surely, 2^{256617832218465} is an apocalyptic number.

It is an amenable number.

256617832218465 is a deficient number, since it is larger than the sum of its proper divisors (154189213762335).

256617832218465 is a wasteful number, since it uses less digits than its factorization.

256617832218465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9104767976.

The product of its digits is 232243200, while the sum is 66.

The spelling of 256617832218465 in words is "two hundred fifty-six trillion, six hundred seventeen billion, eight hundred thirty-two million, two hundred eighteen thousand, four hundred sixty-five".