166491544 has 16 divisors (see below), whose sum is σ = 312507720. Its totient is φ = 83156160.

The previous prime is 166491517. The next prime is 166491551. The reversal of 166491544 is 445194661.

It is a junction number, because it is equal to n+sod(n) for n = 166491497 and 166491506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2949 + ... + 18484.

Almost surely, 2^166491544 is an apocalyptic number.

It is an amenable number.

166491544 is a deficient number, since it is larger than the sum of its proper divisors (146016176).

166491544 is a wasteful number, since it uses less digits than its factorization.

166491544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22410 (or 22406 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 166491544 is about 12903.1602330592. The cubic root of 166491544 is about 550.1283931658.

The spelling of 166491544 in words is "one hundred sixty-six million, four hundred ninety-one thousand, five hundred forty-four".