166416645 has 16 divisors (see below), whose sum is σ = 275448960. Its totient is φ = 85694784.

The previous prime is 166416637. The next prime is 166416667. The reversal of 166416645 is 546614661.

It is a happy number.

It is not a de Polignac number, because 166416645 - 2³ = 166416637 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 190849 + ... + 191718.

It is an arithmetic number, because the mean of its divisors is an integer number (17215560).

Almost surely, 2^166416645 is an apocalyptic number.

166416645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166416645 is a deficient number, since it is larger than the sum of its proper divisors (109032315).

166416645 is a wasteful number, since it uses less digits than its factorization.

166416645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382604.

The product of its digits is 103680, while the sum is 39.

The square root of 166416645 is about 12900.2575555684. The cubic root of 166416645 is about 550.0458859788.

The spelling of 166416645 in words is "one hundred sixty-six million, four hundred sixteen thousand, six hundred forty-five".