166489251 has 16 divisors (see below), whose sum is σ = 229490688. Its totient is φ = 107251200.

The previous prime is 166489247. The next prime is 166489259. The reversal of 166489251 is 152984661.

It is not a de Polignac number, because 166489251 - 2² = 166489247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166489259) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112446 + ... + 113916.

It is an arithmetic number, because the mean of its divisors is an integer number (14343168).

Almost surely, 2^166489251 is an apocalyptic number.

166489251 is a deficient number, since it is larger than the sum of its proper divisors (63001437).

166489251 is a wasteful number, since it uses less digits than its factorization.

166489251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722.

The product of its digits is 103680, while the sum is 42.

The square root of 166489251 is about 12903.0713785517. The cubic root of 166489251 is about 550.1258676117.

The spelling of 166489251 in words is "one hundred sixty-six million, four hundred eighty-nine thousand, two hundred fifty-one".