166166789394 has 32 divisors (see below), whose sum is σ = 336741546240. Its totient is φ = 54658994000.

The previous prime is 166166789363. The next prime is 166166789407. The reversal of 166166789394 is 493987661661.

It is a happy number.

It is a super-2 number, since 2×166166789394² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

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, 449832 + ... + 731219.

It is an arithmetic number, because the mean of its divisors is an integer number (10523173320).

Almost surely, 2^166166789394 is an apocalyptic number.

166166789394 is an abundant number, since it is smaller than the sum of its proper divisors (170574756846).

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

166166789394 is a wasteful number, since it uses less digits than its factorization.

166166789394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181366.

The product of its digits is 70543872, while the sum is 66.

The spelling of 166166789394 in words is "one hundred sixty-six billion, one hundred sixty-six million, seven hundred eighty-nine thousand, three hundred ninety-four".