25540510531931 has 2 divisors, whose sum is σ = 25540510531932. Its totient is φ = 25540510531930.

The previous prime is 25540510531919. The next prime is 25540510531981. The reversal of 25540510531931 is 13913501504552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25540510531931 - 2³⁸ = 25265632624987 is a prime.

It is a super-2 number, since 2×25540510531931² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25540510531981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12770255265965 + 12770255265966.

It is an arithmetic number, because the mean of its divisors is an integer number (12770255265966).

Almost surely, 2^{25540510531931} is an apocalyptic number.

25540510531931 is a deficient number, since it is larger than the sum of its proper divisors (1).

25540510531931 is an equidigital number, since it uses as much as digits as its factorization.

25540510531931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 405000, while the sum is 44.

The spelling of 25540510531931 in words is "twenty-five trillion, five hundred forty billion, five hundred ten million, five hundred thirty-one thousand, nine hundred thirty-one".