25561772324 has 24 divisors (see below), whose sum is σ = 48830136768. Its totient is φ = 11611751840.

The previous prime is 25561772321. The next prime is 25561772329. The reversal of 25561772324 is 42327716552.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (25561772321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109112 + ... + 251055.

It is an arithmetic number, because the mean of its divisors is an integer number (2034589032).

Almost surely, 2^25561772324 is an apocalyptic number.

It is an amenable number.

25561772324 is a deficient number, since it is larger than the sum of its proper divisors (23268364444).

25561772324 is a wasteful number, since it uses less digits than its factorization.

25561772324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361795 (or 361793 counting only the distinct ones).

The product of its digits is 705600, while the sum is 44.

The spelling of 25561772324 in words is "twenty-five billion, five hundred sixty-one million, seven hundred seventy-two thousand, three hundred twenty-four".