166605804 has 36 divisors (see below), whose sum is σ = 422387784. Its totient is φ = 55371072.

The previous prime is 166605787. The next prime is 166605821. The reversal of 166605804 is 408506661.

It is an interprime number because it is at equal distance from previous prime (166605787) and next prime (166605821).

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 5824 + ... + 19160.

It is an arithmetic number, because the mean of its divisors is an integer number (11732994).

Almost surely, 2^166605804 is an apocalyptic number.

It is an amenable number.

166605804 is an abundant number, since it is smaller than the sum of its proper divisors (255781980).

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

166605804 is a wasteful number, since it uses less digits than its factorization.

166605804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13694 (or 13689 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 166605804 is about 12907.5870711764. The cubic root of 166605804 is about 550.2542119608.

The spelling of 166605804 in words is "one hundred sixty-six million, six hundred five thousand, eight hundred four".