15381388816 has 20 divisors (see below), whose sum is σ = 30090778432. Its totient is φ = 7616026656.

The previous prime is 15381388739. The next prime is 15381388849. The reversal of 15381388816 is 61888318351.

It is a happy 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, 4665036 + ... + 4668331.

Almost surely, 2^15381388816 is an apocalyptic number.

15381388816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

15381388816 is a deficient number, since it is larger than the sum of its proper divisors (14709389616).

15381388816 is a wasteful number, since it uses less digits than its factorization.

15381388816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9333478 (or 9333472 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 52.

The spelling of 15381388816 in words is "fifteen billion, three hundred eighty-one million, three hundred eighty-eight thousand, eight hundred sixteen".