256623314467057 has 4 divisors (see below), whose sum is σ = 256670898992100. Its totient is φ = 256575729942016.

The previous prime is 256623314466997. The next prime is 256623314467087. The reversal of 256623314467057 is 750764413326652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 215946522424161 + 40676792042896 = 14695119^2 + 6377836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256623314467057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256623314466986 and 256623314467004.

It is not an unprimeable number, because it can be changed into a prime (256623314467087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23792254432 + ... + 23792265217.

It is an arithmetic number, because the mean of its divisors is an integer number (64167724748025).

Almost surely, 2^{256623314467057} is an apocalyptic number.

It is an amenable number.

256623314467057 is a deficient number, since it is larger than the sum of its proper divisors (47584525043).

256623314467057 is an equidigital number, since it uses as much as digits as its factorization.

256623314467057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47584525042.

The product of its (nonzero) digits is 152409600, while the sum is 61.

The spelling of 256623314467057 in words is "two hundred fifty-six trillion, six hundred twenty-three billion, three hundred fourteen million, four hundred sixty-seven thousand, fifty-seven".