166161601788 has 96 divisors (see below), whose sum is σ = 482101745664. Its totient is φ = 43371030528.

The previous prime is 166161601777. The next prime is 166161601817. The reversal of 166161601788 is 887106161661.

It is a self number, because there is not a number n which added to its sum of digits gives 166161601788.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 678420 + ... + 890267.

It is an arithmetic number, because the mean of its divisors is an integer number (5021893184).

Almost surely, 2^166161601788 is an apocalyptic number.

It is an amenable number.

166161601788 is an abundant number, since it is smaller than the sum of its proper divisors (315940143876).

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

166161601788 is a wasteful number, since it uses less digits than its factorization.

166161601788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568811 (or 1568809 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 51.

The spelling of 166161601788 in words is "one hundred sixty-six billion, one hundred sixty-one million, six hundred one thousand, seven hundred eighty-eight".