25662623490 has 72 divisors (see below), whose sum is σ = 77616356220. Its totient is φ = 5865741504.

The previous prime is 25662623489. The next prime is 25662623491. The reversal of 25662623490 is 9432626652.

25662623490 is a `hidden beast` number, since 2 + 566 + 26 + 23 + 49 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (25662623489) and next prime (25662623491).

It can be written as a sum of positive squares in 2 ways, for example, as 25452054369 + 210569121 = 159537^2 + 14511^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (25662623491) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2905185 + ... + 2914004.

Almost surely, 2^25662623490 is an apocalyptic number.

25662623490 is an abundant number, since it is smaller than the sum of its proper divisors (51953732730).

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

25662623490 is a wasteful number, since it uses less digits than its factorization.

25662623490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5819216 (or 5819206 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 25662623490 in words is "twenty-five billion, six hundred sixty-two million, six hundred twenty-three thousand, four hundred ninety".