166043149 has 2 divisors, whose sum is σ = 166043150. Its totient is φ = 166043148.

The previous prime is 166043123. The next prime is 166043173. The reversal of 166043149 is 941340661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146240649 + 19802500 = 12093^2 + 4450^2 .

It is an emirp because it is prime and its reverse (941340661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166043149 - 2⁹ = 166042637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166043849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83021574 + 83021575.

It is an arithmetic number, because the mean of its divisors is an integer number (83021575).

Almost surely, 2^166043149 is an apocalyptic number.

It is an amenable number.

166043149 is a deficient number, since it is larger than the sum of its proper divisors (1).

166043149 is an equidigital number, since it uses as much as digits as its factorization.

166043149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 166043149 is about 12885.7731238758. The cubic root of 166043149 is about 549.6340805718.

The spelling of 166043149 in words is "one hundred sixty-six million, forty-three thousand, one hundred forty-nine".