25649316131 has 2 divisors, whose sum is σ = 25649316132. Its totient is φ = 25649316130.

The previous prime is 25649316109. The next prime is 25649316163. The reversal of 25649316131 is 13161394652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25649316131 is a prime.

It is a super-2 number, since 2×25649316131² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25649316101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12824658065 + 12824658066.

It is an arithmetic number, because the mean of its divisors is an integer number (12824658066).

Almost surely, 2^25649316131 is an apocalyptic number.

25649316131 is a deficient number, since it is larger than the sum of its proper divisors (1).

25649316131 is an equidigital number, since it uses as much as digits as its factorization.

25649316131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The spelling of 25649316131 in words is "twenty-five billion, six hundred forty-nine million, three hundred sixteen thousand, one hundred thirty-one".