25138877639 has 32 divisors (see below), whose sum is σ = 26468843520. Its totient is φ = 23857846272.

The previous prime is 25138877627. The next prime is 25138877657. The reversal of 25138877639 is 93677883152.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 25138877639 - 2²⁰ = 25137829063 is a prime.

It is a super-2 number, since 2×25138877639² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25138877669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80315747 + ... + 80316059.

It is an arithmetic number, because the mean of its divisors is an integer number (827151360).

Almost surely, 2^25138877639 is an apocalyptic number.

25138877639 is a deficient number, since it is larger than the sum of its proper divisors (1329965881).

25138877639 is a wasteful number, since it uses less digits than its factorization.

25138877639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759.

The product of its digits is 15240960, while the sum is 59.

The spelling of 25138877639 in words is "twenty-five billion, one hundred thirty-eight million, eight hundred seventy-seven thousand, six hundred thirty-nine".