166556745 has 24 divisors (see below), whose sum is σ = 289126656. Its totient is φ = 88698528.

The previous prime is 166556737. The next prime is 166556749. The reversal of 166556745 is 547655661.

It is not a de Polignac number, because 166556745 - 2³ = 166556737 is a prime.

It is a super-2 number, since 2×166556745² = 55482298609990050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 166556745.

It is not an unprimeable number, because it can be changed into a prime (166556749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33064 + ... + 37766.

It is an arithmetic number, because the mean of its divisors is an integer number (12046944).

Almost surely, 2^166556745 is an apocalyptic number.

166556745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166556745 is a deficient number, since it is larger than the sum of its proper divisors (122569911).

166556745 is a wasteful number, since it uses less digits than its factorization.

166556745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5501 (or 5498 counting only the distinct ones).

The product of its digits is 756000, while the sum is 45.

The square root of 166556745 is about 12905.6865373369. The cubic root of 166556745 is about 550.2001970929.

The spelling of 166556745 in words is "one hundred sixty-six million, five hundred fifty-six thousand, seven hundred forty-five".