18166979 has 2 divisors, whose sum is σ = 18166980. Its totient is φ = 18166978.

The previous prime is 18166943. The next prime is 18167011. The reversal of 18166979 is 97966181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18166979 - 2¹² = 18162883 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18166579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9083489 + 9083490.

It is an arithmetic number, because the mean of its divisors is an integer number (9083490).

Almost surely, 2^18166979 is an apocalyptic number.

18166979 is a deficient number, since it is larger than the sum of its proper divisors (1).

18166979 is an equidigital number, since it uses as much as digits as its factorization.

18166979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 18166979 is about 4262.2739236234. The cubic root of 18166979 is about 262.8820330001.

The spelling of 18166979 in words is "eighteen million, one hundred sixty-six thousand, nine hundred seventy-nine".