168515991604 has 12 divisors (see below), whose sum is σ = 310424195200. Its totient is φ = 79823364408.

The previous prime is 168515991571. The next prime is 168515991643. The reversal of 168515991604 is 406199515861.

It is a happy number.

168515991604 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a congruent 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, 1108657764 + ... + 1108657915.

Almost surely, 2^168515991604 is an apocalyptic number.

It is an amenable number.

168515991604 is a deficient number, since it is larger than the sum of its proper divisors (141908203596).

168515991604 is a wasteful number, since it uses less digits than its factorization.

168515991604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2217315702 (or 2217315700 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 55.

The spelling of 168515991604 in words is "one hundred sixty-eight billion, five hundred fifteen million, nine hundred ninety-one thousand, six hundred four".