25512403513 has 4 divisors (see below), whose sum is σ = 25512908148. Its totient is φ = 25511898880.

The previous prime is 25512403507. The next prime is 25512403547. The reversal of 25512403513 is 31530421552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9854135824 + 15658267689 = 99268^2 + 125133^2 .

It is a cyclic number.

It is not a de Polignac number, because 25512403513 - 2⁵ = 25512403481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25512400513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166828 + ... + 280813.

It is an arithmetic number, because the mean of its divisors is an integer number (6378227037).

Almost surely, 2^25512403513 is an apocalyptic number.

It is an amenable number.

25512403513 is a deficient number, since it is larger than the sum of its proper divisors (504635).

25512403513 is an equidigital number, since it uses as much as digits as its factorization.

25512403513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504634.

The product of its (nonzero) digits is 18000, while the sum is 31.

It can be divided in two parts, 25512 and 403513, that added together give a square (429025 = 655²).

The spelling of 25512403513 in words is "twenty-five billion, five hundred twelve million, four hundred three thousand, five hundred thirteen".