166604985 has 32 divisors (see below), whose sum is σ = 309070080. Its totient is φ = 84991104.

The previous prime is 166604957. The next prime is 166604993. The reversal of 166604985 is 589406661.

It is not a de Polignac number, because 166604985 - 2⁷ = 166604857 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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 166604985.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23724 + ... + 29933.

It is an arithmetic number, because the mean of its divisors is an integer number (9658440).

Almost surely, 2^166604985 is an apocalyptic number.

166604985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166604985 is a deficient number, since it is larger than the sum of its proper divisors (142465095).

166604985 is a wasteful number, since it uses less digits than its factorization.

166604985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53694 (or 53688 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 166604985 is about 12907.5553456106. Note that the first 3 decimals coincide. The cubic root of 166604985 is about 550.2533103137.

The spelling of 166604985 in words is "one hundred sixty-six million, six hundred four thousand, nine hundred eighty-five".