15978479900 has 18 divisors (see below), whose sum is σ = 34673301600. Its totient is φ = 6391391920.

The previous prime is 15978479893. The next prime is 15978479921. The reversal of 15978479900 is 997487951.

It is a self number, because there is not a number n which added to its sum of digits gives 15978479900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79892300 + ... + 79892499.

Almost surely, 2^15978479900 is an apocalyptic number.

15978479900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15978479900 is an abundant number, since it is smaller than the sum of its proper divisors (18694821700).

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

15978479900 is a wasteful number, since it uses less digits than its factorization.

15978479900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159784813 (or 159784806 counting only the distinct ones).

The product of its (nonzero) digits is 5715360, while the sum is 59.

The spelling of 15978479900 in words is "fifteen billion, nine hundred seventy-eight million, four hundred seventy-nine thousand, nine hundred".