166605165616 has 20 divisors (see below), whose sum is σ = 326686637592. Its totient is φ = 82298936576.

The previous prime is 166605165607. The next prime is 166605165631. The reversal of 166605165616 is 616561506661.

It is a self number, because there is not a number n which added to its sum of digits gives 166605165616.

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, 62726521 + ... + 62729176.

Almost surely, 2^166605165616 is an apocalyptic number.

166605165616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

166605165616 is a deficient number, since it is larger than the sum of its proper divisors (160081471976).

166605165616 is a wasteful number, since it uses less digits than its factorization.

166605165616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125455788 (or 125455782 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 166605165616 in words is "one hundred sixty-six billion, six hundred five million, one hundred sixty-five thousand, six hundred sixteen".