25131013015 has 4 divisors (see below), whose sum is σ = 30157215624. Its totient is φ = 20104810408.

The previous prime is 25131012989. The next prime is 25131013097. The reversal of 25131013015 is 51031013152.

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

It is a cyclic number.

It is not a de Polignac number, because 25131013015 - 2⁷ = 25131012887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2513101297 + ... + 2513101306.

It is an arithmetic number, because the mean of its divisors is an integer number (7539303906).

Almost surely, 2^25131013015 is an apocalyptic number.

25131013015 is a deficient number, since it is larger than the sum of its proper divisors (5026202609).

25131013015 is an equidigital number, since it uses as much as digits as its factorization.

25131013015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5026202608.

The product of its (nonzero) digits is 450, while the sum is 22.

Adding to 25131013015 its reverse (51031013152), we get a palindrome (76162026167).

The spelling of 25131013015 in words is "twenty-five billion, one hundred thirty-one million, thirteen thousand, fifteen".