25956318091 has 16 divisors (see below), whose sum is σ = 28386183168. Its totient is φ = 23538240000.

The previous prime is 25956318077. The next prime is 25956318109. The reversal of 25956318091 is 19081365952.

It is a de Polignac number, because none of the positive numbers 2^k-25956318091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25906318091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12283051 + ... + 12285163.

It is an arithmetic number, because the mean of its divisors is an integer number (1774136448).

Almost surely, 2^25956318091 is an apocalyptic number.

25956318091 is a deficient number, since it is larger than the sum of its proper divisors (2429865077).

25956318091 is a wasteful number, since it uses less digits than its factorization.

25956318091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4362.

The product of its (nonzero) digits is 583200, while the sum is 49.

The spelling of 25956318091 in words is "twenty-five billion, nine hundred fifty-six million, three hundred eighteen thousand, ninety-one".