166849999 has 2 divisors, whose sum is σ = 166850000. Its totient is φ = 166849998.

The previous prime is 166849993. The next prime is 166850063. The reversal of 166849999 is 999948661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166849999 - 2⁷ = 166849871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166849993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83424999 + 83425000.

It is an arithmetic number, because the mean of its divisors is an integer number (83425000).

Almost surely, 2^166849999 is an apocalyptic number.

166849999 is a deficient number, since it is larger than the sum of its proper divisors (1).

166849999 is an equidigital number, since it uses as much as digits as its factorization.

166849999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7558272, while the sum is 61.

The square root of 166849999 is about 12917.0429665617. The cubic root of 166849999 is about 550.5229175498.

The spelling of 166849999 in words is "one hundred sixty-six million, eight hundred forty-nine thousand, nine hundred ninety-nine".