25140137765 has 4 divisors (see below), whose sum is σ = 30168165324. Its totient is φ = 20112110208.

The previous prime is 25140137753. The next prime is 25140137767. The reversal of 25140137765 is 56773104152.

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 5903002561 + 19237135204 = 76831^2 + 138698^2 .

It is a cyclic number.

It is not a de Polignac number, because 25140137765 - 2²⁸ = 24871702309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25140137767) 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, 2514013772 + ... + 2514013781.

It is an arithmetic number, because the mean of its divisors is an integer number (7542041331).

Almost surely, 2^25140137765 is an apocalyptic number.

It is an amenable number.

25140137765 is a deficient number, since it is larger than the sum of its proper divisors (5028027559).

25140137765 is an equidigital number, since it uses as much as digits as its factorization.

25140137765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5028027558.

The product of its (nonzero) digits is 176400, while the sum is 41.

The spelling of 25140137765 in words is "twenty-five billion, one hundred forty million, one hundred thirty-seven thousand, seven hundred sixty-five".