25512207023521 has 9 divisors (see below), whose sum is σ = 26669782093521. Its totient is φ = 24402869510052.

The previous prime is 25512207023473. The next prime is 25512207023561. The reversal of 25512207023521 is 12532070221552.

The square root of 25512207023521 is 5050961.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 25512207023521 - 2⁷ = 25512207023393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25512207023561) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 116062300 + ... + 116281906.

Almost surely, 2^{25512207023521} is an apocalyptic number.

25512207023521 is the 5050961-st square number.

25512207023521 is the 2525481-st centered octagonal number.

It is an amenable number.

25512207023521 is a deficient number, since it is larger than the sum of its proper divisors (1157575070000).

25512207023521 is an frugal number, since it uses more digits than its factorization.

25512207023521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439260 (or 219630 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 37.

The spelling of 25512207023521 in words is "twenty-five trillion, five hundred twelve billion, two hundred seven million, twenty-three thousand, five hundred twenty-one".