166500665 has 8 divisors (see below), whose sum is σ = 199913280. Its totient is φ = 133125552.

The previous prime is 166500647. The next prime is 166500671. The reversal of 166500665 is 566005661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166500665 - 2⁸ = 166500409 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1556 + ... + 18314.

It is an arithmetic number, because the mean of its divisors is an integer number (24989160).

Almost surely, 2^166500665 is an apocalyptic number.

It is an amenable number.

166500665 is a deficient number, since it is larger than the sum of its proper divisors (33412615).

166500665 is a wasteful number, since it uses less digits than its factorization.

166500665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18751.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 166500665 is about 12903.5136687648. The cubic root of 166500665 is about 550.1384389802.

The spelling of 166500665 in words is "one hundred sixty-six million, five hundred thousand, six hundred sixty-five".