166685355 has 12 divisors (see below), whose sum is σ = 288921360. Its totient is φ = 88898832.

The previous prime is 166685293. The next prime is 166685369. The reversal of 166685355 is 553586661.

It is not a de Polignac number, because 166685355 - 2⁶ = 166685291 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 3704119 = 166685355 / (1 + 6 + 6 + 6 + 8 + 5 + 3 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 166685355.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1852015 + ... + 1852104.

It is an arithmetic number, because the mean of its divisors is an integer number (24076780).

Almost surely, 2^166685355 is an apocalyptic number.

166685355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166685355 is a deficient number, since it is larger than the sum of its proper divisors (122236005).

166685355 is a wasteful number, since it uses less digits than its factorization.

166685355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704130 (or 3704127 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 166685355 is about 12910.6682631071. The cubic root of 166685355 is about 550.3417765527.

The spelling of 166685355 in words is "one hundred sixty-six million, six hundred eighty-five thousand, three hundred fifty-five".