25138320757 has 6 divisors (see below), whose sum is σ = 27631377494. Its totient is φ = 22853018760.

The previous prime is 25138320751. The next prime is 25138320793. The reversal of 25138320757 is 75702383152.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21358653316 + 3779667441 = 146146^2 + 61479^2 .

It is not a de Polignac number, because 25138320757 - 2²⁷ = 25004103029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25138320751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103877238 + ... + 103877479.

Almost surely, 2^25138320757 is an apocalyptic number.

It is an amenable number.

25138320757 is a deficient number, since it is larger than the sum of its proper divisors (2493056737).

25138320757 is a wasteful number, since it uses less digits than its factorization.

25138320757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207754739 (or 207754728 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 43.

The spelling of 25138320757 in words is "twenty-five billion, one hundred thirty-eight million, three hundred twenty thousand, seven hundred fifty-seven".