25347661931 has 2 divisors, whose sum is σ = 25347661932. Its totient is φ = 25347661930.

The previous prime is 25347661919. The next prime is 25347661967. The reversal of 25347661931 is 13916674352.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25347661931 - 2²² = 25343467627 is a prime.

It is a super-2 number, since 2×25347661931² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25347661981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12673830965 + 12673830966.

It is an arithmetic number, because the mean of its divisors is an integer number (12673830966).

Almost surely, 2^25347661931 is an apocalyptic number.

25347661931 is a deficient number, since it is larger than the sum of its proper divisors (1).

25347661931 is an equidigital number, since it uses as much as digits as its factorization.

25347661931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 47.

The spelling of 25347661931 in words is "twenty-five billion, three hundred forty-seven million, six hundred sixty-one thousand, nine hundred thirty-one".