166779979 has 8 divisors (see below), whose sum is σ = 181363968. Its totient is φ = 152726400.

The previous prime is 166779971. The next prime is 166779997. The reversal of 166779979 is 979977661.

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 166779979 - 2³ = 166779971 is a prime.

It is a super-2 number, since 2×166779979² = 55631122790480882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166779971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131947 + ... + 133204.

It is an arithmetic number, because the mean of its divisors is an integer number (22670496).

Almost surely, 2^166779979 is an apocalyptic number.

166779979 is a deficient number, since it is larger than the sum of its proper divisors (14583989).

166779979 is a wasteful number, since it uses less digits than its factorization.

166779979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265205.

The product of its digits is 9001692, while the sum is 61.

The square root of 166779979 is about 12914.3323094924. The cubic root of 166779979 is about 550.4458962563.

The spelling of 166779979 in words is "one hundred sixty-six million, seven hundred seventy-nine thousand, nine hundred seventy-nine".