15660399368 has 32 divisors (see below), whose sum is σ = 29819210400. Its totient is φ = 7708749312.

The previous prime is 15660399353. The next prime is 15660399379. The reversal of 15660399368 is 86399306651.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1004771 + ... + 1020237.

It is an arithmetic number, because the mean of its divisors is an integer number (931850325).

Almost surely, 2^15660399368 is an apocalyptic number.

It is an amenable number.

15660399368 is a deficient number, since it is larger than the sum of its proper divisors (14158811032).

15660399368 is a wasteful number, since it uses less digits than its factorization.

15660399368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17429 (or 17425 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 56.

The spelling of 15660399368 in words is "fifteen billion, six hundred sixty million, three hundred ninety-nine thousand, three hundred sixty-eight".