16668186664 has 64 divisors (see below), whose sum is σ = 34000560000. Its totient is φ = 7639247616.

The previous prime is 16668186659. The next prime is 16668186719. The reversal of 16668186664 is 46668186661.

It is a happy number.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 16668186599 and 16668186608.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399462 + ... + 439210.

It is an arithmetic number, because the mean of its divisors is an integer number (531258750).

Almost surely, 2^16668186664 is an apocalyptic number.

It is an amenable number.

16668186664 is an abundant number, since it is smaller than the sum of its proper divisors (17332373336).

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

16668186664 is a wasteful number, since it uses less digits than its factorization.

16668186664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39874 (or 39870 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 58.

The spelling of 16668186664 in words is "sixteen billion, six hundred sixty-eight million, one hundred eighty-six thousand, six hundred sixty-four".