25663621140 has 36 divisors (see below), whose sum is σ = 77846318004. Its totient is φ = 6843632256.

The previous prime is 25663621133. The next prime is 25663621153. The reversal of 25663621140 is 4112636652.

25663621140 is a `hidden beast` number, since 2 + 5 + 6 + 636 + 2 + 1 + 14 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4022857476 + 21640763664 = 63426^2 + 147108^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25663621095 and 25663621104.

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, 71287657 + ... + 71288016.

Almost surely, 2^25663621140 is an apocalyptic number.

25663621140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25663621140 is an abundant number, since it is smaller than the sum of its proper divisors (52182696864).

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

25663621140 is a wasteful number, since it uses less digits than its factorization.

25663621140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142575688 (or 142575683 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 25663621140 in words is "twenty-five billion, six hundred sixty-three million, six hundred twenty-one thousand, one hundred forty".