25655138628 has 24 divisors (see below), whose sum is σ = 68413703232. Its totient is φ = 7330039584.

The previous prime is 25655138609. The next prime is 25655138669. The reversal of 25655138628 is 82683155652.

It is a happy number.

It is a super-2 number, since 2×25655138628² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152709075 + ... + 152709242.

It is an arithmetic number, because the mean of its divisors is an integer number (2850570968).

Almost surely, 2^25655138628 is an apocalyptic number.

25655138628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25655138628 is an abundant number, since it is smaller than the sum of its proper divisors (42758564604).

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

25655138628 is a wasteful number, since it uses less digits than its factorization.

25655138628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305418331 (or 305418329 counting only the distinct ones).

The product of its digits is 3456000, while the sum is 51.

The spelling of 25655138628 in words is "twenty-five billion, six hundred fifty-five million, one hundred thirty-eight thousand, six hundred twenty-eight".