256500361656505 has 8 divisors (see below), whose sum is σ = 307801166817024. Its totient is φ = 205199800772400.

The previous prime is 256500361656503. The next prime is 256500361656523. The reversal of 256500361656505 is 505656163005652.

256500361656505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256500361656505 - 2¹ = 256500361656503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256500361656503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58751011 + ... + 62965720.

It is an arithmetic number, because the mean of its divisors is an integer number (38475145852128).

Almost surely, 2^{256500361656505} is an apocalyptic number.

It is an amenable number.

256500361656505 is a deficient number, since it is larger than the sum of its proper divisors (51300805160519).

256500361656505 is a wasteful number, since it uses less digits than its factorization.

256500361656505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122138207.

The product of its (nonzero) digits is 24300000, while the sum is 55.

The spelling of 256500361656505 in words is "two hundred fifty-six trillion, five hundred billion, three hundred sixty-one million, six hundred fifty-six thousand, five hundred five".