25316538521 has 8 divisors (see below), whose sum is σ = 25802588160. Its totient is φ = 24834968928.

The previous prime is 25316538493. The next prime is 25316538551. The reversal of 25316538521 is 12583561352.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25316538521 - 2²⁶ = 25249429657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25316538551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1108601 + ... + 1131206.

It is an arithmetic number, because the mean of its divisors is an integer number (3225323520).

Almost surely, 2^25316538521 is an apocalyptic number.

It is an amenable number.

25316538521 is a deficient number, since it is larger than the sum of its proper divisors (486049639).

25316538521 is a wasteful number, since it uses less digits than its factorization.

25316538521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240023.

The product of its digits is 216000, while the sum is 41.

The spelling of 25316538521 in words is "twenty-five billion, three hundred sixteen million, five hundred thirty-eight thousand, five hundred twenty-one".