166718579779 has 8 divisors (see below), whose sum is σ = 167576975280. Its totient is φ = 165860306976.

The previous prime is 166718579773. The next prime is 166718579791. The reversal of 166718579779 is 977975817661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166718579779 - 2²⁷ = 166584362051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166718579773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4149117 + ... + 4189105.

It is an arithmetic number, because the mean of its divisors is an integer number (20947121910).

Almost surely, 2^166718579779 is an apocalyptic number.

166718579779 is a deficient number, since it is larger than the sum of its proper divisors (858395501).

166718579779 is a wasteful number, since it uses less digits than its factorization.

166718579779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61349.

The product of its digits is 280052640, while the sum is 73.

The spelling of 166718579779 in words is "one hundred sixty-six billion, seven hundred eighteen million, five hundred seventy-nine thousand, seven hundred seventy-nine".