25539628521 has 16 divisors (see below), whose sum is σ = 37151896320. Its totient is φ = 15477168720.

The previous prime is 25539628493. The next prime is 25539628567. The reversal of 25539628521 is 12582693552.

It is not a de Polignac number, because 25539628521 - 2⁵ = 25539628489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25539628021) 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, 429426 + ... + 485268.

It is an arithmetic number, because the mean of its divisors is an integer number (2321993520).

Almost surely, 2^25539628521 is an apocalyptic number.

It is an amenable number.

25539628521 is a deficient number, since it is larger than the sum of its proper divisors (11612267799).

25539628521 is a wasteful number, since it uses less digits than its factorization.

25539628521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69716.

The product of its digits is 1296000, while the sum is 48.

The spelling of 25539628521 in words is "twenty-five billion, five hundred thirty-nine million, six hundred twenty-eight thousand, five hundred twenty-one".