25138765126388 has 12 divisors (see below), whose sum is σ = 44216152875972. Its totient is φ = 12505578590400.

The previous prime is 25138765126351. The next prime is 25138765126421. The reversal of 25138765126388 is 88362156783152.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21941148803044 + 3197616323344 = 4684138^2 + 1788188^2 .

It is a super-2 number, since 2×25138765126388² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15950992313 + ... + 15950993888.

It is an arithmetic number, because the mean of its divisors is an integer number (3684679406331).

Almost surely, 2^{25138765126388} is an apocalyptic number.

It is an amenable number.

25138765126388 is a deficient number, since it is larger than the sum of its proper divisors (19077387749584).

25138765126388 is a wasteful number, since it uses less digits than its factorization.

25138765126388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31901986402 (or 31901986400 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 65.

The spelling of 25138765126388 in words is "twenty-five trillion, one hundred thirty-eight billion, seven hundred sixty-five million, one hundred twenty-six thousand, three hundred eighty-eight".