15172803978 has 16 divisors (see below), whose sum is σ = 30567110400. Its totient is φ = 5020684256.

The previous prime is 15172803941. The next prime is 15172803983. The reversal of 15172803978 is 87930827151.

15172803978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 15172803978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9228378 + ... + 9230021.

It is an arithmetic number, because the mean of its divisors is an integer number (1910444400).

Almost surely, 2^15172803978 is an apocalyptic number.

15172803978 is an abundant number, since it is smaller than the sum of its proper divisors (15394306422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15172803978 is a wasteful number, since it uses less digits than its factorization.

15172803978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18458541.

The product of its (nonzero) digits is 846720, while the sum is 51.

The spelling of 15172803978 in words is "fifteen billion, one hundred seventy-two million, eight hundred three thousand, nine hundred seventy-eight".