15138286817 has 4 divisors (see below), whose sum is σ = 15138544320. Its totient is φ = 15138029316.

The previous prime is 15138286753. The next prime is 15138286829. The reversal of 15138286817 is 71868283151.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71868283151 = 7 ⋅10266897593.

It is a cyclic number.

It is not a de Polignac number, because 15138286817 - 2⁶ = 15138286753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15137286817) 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 3 ways as a sum of consecutive naturals, for example, 7484 + ... + 174162.

It is an arithmetic number, because the mean of its divisors is an integer number (3784636080).

Almost surely, 2^15138286817 is an apocalyptic number.

It is an amenable number.

15138286817 is a deficient number, since it is larger than the sum of its proper divisors (257503).

15138286817 is an equidigital number, since it uses as much as digits as its factorization.

15138286817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257502.

The product of its digits is 645120, while the sum is 50.

The spelling of 15138286817 in words is "fifteen billion, one hundred thirty-eight million, two hundred eighty-six thousand, eight hundred seventeen".