25318545913 has 4 divisors (see below), whose sum is σ = 25318987600. Its totient is φ = 25318104228.

The previous prime is 25318545911. The next prime is 25318545929. The reversal of 25318545913 is 31954581352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25318545913 - 2¹ = 25318545911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25318545911) 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, 119295 + ... + 254692.

It is an arithmetic number, because the mean of its divisors is an integer number (6329746900).

Almost surely, 2^25318545913 is an apocalyptic number.

It is an amenable number.

25318545913 is a deficient number, since it is larger than the sum of its proper divisors (441687).

25318545913 is an equidigital number, since it uses as much as digits as its factorization.

25318545913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441686.

The product of its digits is 648000, while the sum is 46.

The spelling of 25318545913 in words is "twenty-five billion, three hundred eighteen million, five hundred forty-five thousand, nine hundred thirteen".