15660661392 has 160 divisors (see below), whose sum is σ = 47664092160. Its totient is φ = 4906137600.

The previous prime is 15660661267. The next prime is 15660661417. The reversal of 15660661392 is 29316606651.

15660661392 is a `hidden beast` number, since 1 + 5 + 6 + 606 + 6 + 1 + 39 + 2 = 666.

15660661392 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 31 ways as a sum of consecutive naturals, for example, 8026017 + ... + 8027967.

It is an arithmetic number, because the mean of its divisors is an integer number (297900576).

Almost surely, 2^15660661392 is an apocalyptic number.

15660661392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15660661392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23832046080).

15660661392 is an abundant number, since it is smaller than the sum of its proper divisors (32003430768).

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

15660661392 is a wasteful number, since it uses less digits than its factorization.

15660661392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3078 (or 3066 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 15660661392 in words is "fifteen billion, six hundred sixty million, six hundred sixty-one thousand, three hundred ninety-two".