15813838125 has 30 divisors (see below), whose sum is σ = 28543636550. Its totient is φ = 8434044000.

The previous prime is 15813838099. The next prime is 15813838153. The reversal of 15813838125 is 52183831851.

15813838125 is a `hidden beast` number, since 1 + 581 + 38 + 38 + 1 + 2 + 5 = 666.

It can be written as a sum of positive squares in 5 ways, for example, as 3909500676 + 11904337449 = 62526^2 + 109107^2 .

It is not a de Polignac number, because 15813838125 - 2¹⁰ = 15813837101 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1400050 + ... + 1411299.

Almost surely, 2^15813838125 is an apocalyptic number.

15813838125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15813838125 is a deficient number, since it is larger than the sum of its proper divisors (12729798425).

15813838125 is an equidigital number, since it uses as much as digits as its factorization.

15813838125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2811375 (or 2811357 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The spelling of 15813838125 in words is "fifteen billion, eight hundred thirteen million, eight hundred thirty-eight thousand, one hundred twenty-five".