25915851931 has 2 divisors, whose sum is σ = 25915851932. Its totient is φ = 25915851930.

The previous prime is 25915851919. The next prime is 25915851959. The reversal of 25915851931 is 13915851952.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25915851931 - 2⁹ = 25915851419 is a prime.

It is a super-2 number, since 2×25915851931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25915858931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12957925965 + 12957925966.

It is an arithmetic number, because the mean of its divisors is an integer number (12957925966).

Almost surely, 2^25915851931 is an apocalyptic number.

25915851931 is a deficient number, since it is larger than the sum of its proper divisors (1).

25915851931 is an equidigital number, since it uses as much as digits as its factorization.

25915851931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486000, while the sum is 49.

The spelling of 25915851931 in words is "twenty-five billion, nine hundred fifteen million, eight hundred fifty-one thousand, nine hundred thirty-one".