25440131745 has 24 divisors (see below), whose sum is σ = 50395690176. Its totient is φ = 11629774368.

The previous prime is 25440131723. The next prime is 25440131771. The reversal of 25440131745 is 54713104452.

It is not a de Polignac number, because 25440131745 - 2¹⁴ = 25440115361 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40380847 + ... + 40381476.

It is an arithmetic number, because the mean of its divisors is an integer number (2099820424).

Almost surely, 2^25440131745 is an apocalyptic number.

It is an amenable number.

25440131745 is a deficient number, since it is larger than the sum of its proper divisors (24955558431).

25440131745 is a wasteful number, since it uses less digits than its factorization.

25440131745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80762341 (or 80762338 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

It can be divided in two parts, 254401 and 31745, that added together give a triangular number (286146 = T₇₅₆).

The spelling of 25440131745 in words is "twenty-five billion, four hundred forty million, one hundred thirty-one thousand, seven hundred forty-five".