25917764432 has 60 divisors (see below), whose sum is σ = 58711013460. Its totient is φ = 11051163648.

The previous prime is 25917764413. The next prime is 25917764441. The reversal of 25917764432 is 23446771952.

It can be written as a sum of positive squares in 2 ways, for example, as 20931144976 + 4986619456 = 144676^2 + 70616^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70544 + ... + 238352.

It is an arithmetic number, because the mean of its divisors is an integer number (978516891).

Almost surely, 2^25917764432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25917764432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29355506730).

25917764432 is an abundant number, since it is smaller than the sum of its proper divisors (32793249028).

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

25917764432 is a wasteful number, since it uses less digits than its factorization.

25917764432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168028 (or 168015 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 50.

The spelling of 25917764432 in words is "twenty-five billion, nine hundred seventeen million, seven hundred sixty-four thousand, four hundred thirty-two".