25926612161 has 48 divisors (see below), whose sum is σ = 30047144400. Its totient is φ = 22262575104.

The previous prime is 25926612157. The next prime is 25926612193. The reversal of 25926612161 is 16121662952.

It can be written as a sum of positive squares in 8 ways, for example, as 2158531600 + 23768080561 = 46460^2 + 154169^2 .

It is not a de Polignac number, because 25926612161 - 2² = 25926612157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25926618161) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23210375 + ... + 23211491.

It is an arithmetic number, because the mean of its divisors is an integer number (625982175).

Almost surely, 2^25926612161 is an apocalyptic number.

It is an amenable number.

25926612161 is a deficient number, since it is larger than the sum of its proper divisors (4120532239).

25926612161 is a wasteful number, since it uses less digits than its factorization.

25926612161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298 (or 1275 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The spelling of 25926612161 in words is "twenty-five billion, nine hundred twenty-six million, six hundred twelve thousand, one hundred sixty-one".