25902510985 has 16 divisors (see below), whose sum is σ = 34186231296. Its totient is φ = 18721027008.

The previous prime is 25902510971. The next prime is 25902511009. The reversal of 25902510985 is 58901520952.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25902510985 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4236309 + ... + 4242418.

It is an arithmetic number, because the mean of its divisors is an integer number (2136639456).

Almost surely, 2^25902510985 is an apocalyptic number.

It is an amenable number.

25902510985 is a deficient number, since it is larger than the sum of its proper divisors (8283720311).

25902510985 is a wasteful number, since it uses less digits than its factorization.

25902510985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8478792.

The product of its (nonzero) digits is 324000, while the sum is 46.

The spelling of 25902510985 in words is "twenty-five billion, nine hundred two million, five hundred ten thousand, nine hundred eighty-five".