166218149 has 2 divisors, whose sum is σ = 166218150. Its totient is φ = 166218148.

The previous prime is 166218119. The next prime is 166218161. The reversal of 166218149 is 941812661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166152100 + 66049 = 12890^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 166218149 - 2⁸ = 166217893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166218119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83109074 + 83109075.

It is an arithmetic number, because the mean of its divisors is an integer number (83109075).

Almost surely, 2^166218149 is an apocalyptic number.

It is an amenable number.

166218149 is a deficient number, since it is larger than the sum of its proper divisors (1).

166218149 is an equidigital number, since it uses as much as digits as its factorization.

166218149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 166218149 is about 12892.5617702612. The cubic root of 166218149 is about 549.8271070892.

The spelling of 166218149 in words is "one hundred sixty-six million, two hundred eighteen thousand, one hundred forty-nine".