256066225666931 has 2 divisors, whose sum is σ = 256066225666932. Its totient is φ = 256066225666930.

The previous prime is 256066225666921. The next prime is 256066225666963. The reversal of 256066225666931 is 139666522660652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256066225666931 is a prime.

It is a super-2 number, since 2×256066225666931² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256066225666921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128033112833465 + 128033112833466.

It is an arithmetic number, because the mean of its divisors is an integer number (128033112833466).

Almost surely, 2^{256066225666931} is an apocalyptic number.

256066225666931 is a deficient number, since it is larger than the sum of its proper divisors (1).

256066225666931 is an equidigital number, since it uses as much as digits as its factorization.

256066225666931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 251942400, while the sum is 65.

The spelling of 256066225666931 in words is "two hundred fifty-six trillion, sixty-six billion, two hundred twenty-five million, six hundred sixty-six thousand, nine hundred thirty-one".