15268138513 has 4 divisors (see below), whose sum is σ = 15313444900. Its totient is φ = 15222832128.

The previous prime is 15268138471. The next prime is 15268138603. The reversal of 15268138513 is 31583186251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31583186251 = 73 ⋅432646387.

It can be written as a sum of positive squares in 2 ways, for example, as 1279635984 + 13988502529 = 35772^2 + 118273^2 .

It is a cyclic number.

It is not a de Polignac number, because 15268138513 - 2²⁵ = 15234584081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15268138513.

It is not an unprimeable number, because it can be changed into a prime (15268138213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22652688 + ... + 22653361.

It is an arithmetic number, because the mean of its divisors is an integer number (3828361225).

Almost surely, 2^15268138513 is an apocalyptic number.

It is an amenable number.

15268138513 is a deficient number, since it is larger than the sum of its proper divisors (45306387).

15268138513 is an equidigital number, since it uses as much as digits as its factorization.

15268138513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45306386.

The product of its digits is 172800, while the sum is 43.

The spelling of 15268138513 in words is "fifteen billion, two hundred sixty-eight million, one hundred thirty-eight thousand, five hundred thirteen".