25291813264 has 60 divisors (see below), whose sum is σ = 50961995292. Its totient is φ = 12158864640.

The previous prime is 25291813247. The next prime is 25291813279. The reversal of 25291813264 is 46231819252.

It can be written as a sum of positive squares in 2 ways, for example, as 13384638864 + 11907174400 = 115692^2 + 109120^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25291813264.

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, 2408794 + ... + 2419270.

Almost surely, 2^25291813264 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 25291813264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25480997646).

25291813264 is an abundant number, since it is smaller than the sum of its proper divisors (25670182028).

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

25291813264 is a wasteful number, since it uses less digits than its factorization.

25291813264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10704 (or 10667 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The spelling of 25291813264 in words is "twenty-five billion, two hundred ninety-one million, eight hundred thirteen thousand, two hundred sixty-four".