256309310077 has 4 divisors (see below), whose sum is σ = 256985588320. Its totient is φ = 255633031836.

The previous prime is 256309310071. The next prime is 256309310083. The reversal of 256309310077 is 770013903652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (256309310071) and next prime (256309310083).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256309310077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256309310071) 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, 338138553 + ... + 338139310.

It is an arithmetic number, because the mean of its divisors is an integer number (64246397080).

Almost surely, 2^256309310077 is an apocalyptic number.

It is an amenable number.

256309310077 is a deficient number, since it is larger than the sum of its proper divisors (676278243).

256309310077 is an equidigital number, since it uses as much as digits as its factorization.

256309310077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676278242.

The product of its (nonzero) digits is 238140, while the sum is 43.

The spelling of 256309310077 in words is "two hundred fifty-six billion, three hundred nine million, three hundred ten thousand, seventy-seven".