12520491025 has 81 divisors (see below), whose sum is σ = 19016335611. Its totient is φ = 8153117280.

The previous prime is 12520490993. The next prime is 12520491031. The reversal of 12520491025 is 52019402521.

The square root of 12520491025 is 111895.

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

It can be written as a sum of positive squares in only one way, i.e., 4507376769 + 8013114256 = 67137^2 + 89516^2 .

It is not a de Polignac number, because 12520491025 - 2⁵ = 12520490993 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 90075406 + ... + 90075544.

Almost surely, 2^12520491025 is an apocalyptic number.

12520491025 is the 111895-th square number.

12520491025 is the 55948-th centered octagonal number.

It is an amenable number.

12520491025 is a deficient number, since it is larger than the sum of its proper divisors (6495844586).

12520491025 is an equidigital number, since it uses as much as digits as its factorization.

12520491025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 12520491025 its reverse (52019402521), we get a palindrome (64539893546).

The spelling of 12520491025 in words is "twelve billion, five hundred twenty million, four hundred ninety-one thousand, twenty-five".