256608211831 has 2 divisors, whose sum is σ = 256608211832. Its totient is φ = 256608211830.

The previous prime is 256608211823. The next prime is 256608211861. The reversal of 256608211831 is 138112806652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256608211831 - 2³ = 256608211823 is a prime.

It is a super-2 number, since 2×256608211831² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256608211861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128304105915 + 128304105916.

It is an arithmetic number, because the mean of its divisors is an integer number (128304105916).

Almost surely, 2^256608211831 is an apocalyptic number.

256608211831 is a deficient number, since it is larger than the sum of its proper divisors (1).

256608211831 is an equidigital number, since it uses as much as digits as its factorization.

256608211831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 256608211831 in words is "two hundred fifty-six billion, six hundred eight million, two hundred eleven thousand, eight hundred thirty-one".