25665621364 has 12 divisors (see below), whose sum is σ = 44916089764. Its totient is φ = 12832452864.

The previous prime is 25665621349. The next prime is 25665621419. The reversal of 25665621364 is 46312656652.

It can be written as a sum of positive squares in 2 ways, for example, as 11062832400 + 14602788964 = 105180^2 + 120842^2 .

It is a congruent number.

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, 133894 + ... + 263170.

Almost surely, 2^25665621364 is an apocalyptic number.

It is an amenable number.

25665621364 is a deficient number, since it is larger than the sum of its proper divisors (19250468400).

25665621364 is a wasteful number, since it uses less digits than its factorization.

25665621364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178914 (or 178912 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 46.

The spelling of 25665621364 in words is "twenty-five billion, six hundred sixty-five million, six hundred twenty-one thousand, three hundred sixty-four".