25621235488 has 24 divisors (see below), whose sum is σ = 51805101852. Its totient is φ = 12464384256.

The previous prime is 25621235459. The next prime is 25621235509. The reversal of 25621235488 is 88453212652.

It can be written as a sum of positive squares in 2 ways, for example, as 22568451984 + 3052783504 = 150228^2 + 55252^2 .

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, 10818595 + ... + 10820962.

Almost surely, 2^25621235488 is an apocalyptic number.

It is an amenable number.

25621235488 is an abundant number, since it is smaller than the sum of its proper divisors (26183866364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25621235488 is a wasteful number, since it uses less digits than its factorization.

25621235488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21639604 (or 21639596 counting only the distinct ones).

The product of its digits is 921600, while the sum is 46.

The spelling of 25621235488 in words is "twenty-five billion, six hundred twenty-one million, two hundred thirty-five thousand, four hundred eighty-eight".