25726417931 has 2 divisors, whose sum is σ = 25726417932. Its totient is φ = 25726417930.

The previous prime is 25726417831. The next prime is 25726417961. The reversal of 25726417931 is 13971462752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25726417931 is a prime.

It is a super-2 number, since 2×25726417931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25726417961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12863208965 + 12863208966.

It is an arithmetic number, because the mean of its divisors is an integer number (12863208966).

Almost surely, 2^25726417931 is an apocalyptic number.

25726417931 is a deficient number, since it is larger than the sum of its proper divisors (1).

25726417931 is an equidigital number, since it uses as much as digits as its factorization.

25726417931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 47.

The spelling of 25726417931 in words is "twenty-five billion, seven hundred twenty-six million, four hundred seventeen thousand, nine hundred thirty-one".