166645560 has 64 divisors (see below), whose sum is σ = 529351200. Its totient is φ = 41824256.

The previous prime is 166645547. The next prime is 166645601. The reversal of 166645560 is 65546661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38805 + ... + 42884.

Almost surely, 2^166645560 is an apocalyptic number.

166645560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166645560 is an abundant number, since it is smaller than the sum of its proper divisors (362705640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166645560 is a wasteful number, since it uses less digits than its factorization.

166645560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81720 (or 81716 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 166645560 is about 12909.1270037908. The cubic root of 166645560 is about 550.2979762758.

The spelling of 166645560 in words is "one hundred sixty-six million, six hundred forty-five thousand, five hundred sixty".