25513992361 has 27 divisors (see below), whose sum is σ = 30394713573. Its totient is φ = 21391175520.

The previous prime is 25513992311. The next prime is 25513992367. The reversal of 25513992361 is 16329931552.

The square root of 25513992361 is 159731.

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

It can be written as a sum of positive squares in 4 ways, for example, as 17218425961 + 8295566400 = 131219^2 + 91080^2 .

It is not a de Polignac number, because 25513992361 - 2²⁷ = 25379774633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25513992367) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 22840975 + ... + 22842091.

Almost surely, 2^25513992361 is an apocalyptic number.

25513992361 is the 159731-st square number.

25513992361 is the 79866-th centered octagonal number.

It is an amenable number.

25513992361 is a deficient number, since it is larger than the sum of its proper divisors (4880721212).

25513992361 is an equidigital number, since it uses as much as digits as its factorization.

25513992361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282 (or 1141 counting only the distinct ones).

The product of its digits is 437400, while the sum is 46.

The spelling of 25513992361 in words is "twenty-five billion, five hundred thirteen million, nine hundred ninety-two thousand, three hundred sixty-one".