166115665 has 8 divisors (see below), whose sum is σ = 203974848. Its totient is φ = 129801840.

The previous prime is 166115657. The next prime is 166115669. The reversal of 166115665 is 566511661.

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

It is not a de Polignac number, because 166115665 - 2³ = 166115657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166115669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386101 + ... + 386530.

It is an arithmetic number, because the mean of its divisors is an integer number (25496856).

Almost surely, 2^166115665 is an apocalyptic number.

It is an amenable number.

166115665 is a deficient number, since it is larger than the sum of its proper divisors (37859183).

166115665 is an equidigital number, since it uses as much as digits as its factorization.

166115665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772679.

The product of its digits is 32400, while the sum is 37.

The square root of 166115665 is about 12888.5866176241. The cubic root of 166115665 is about 549.7140827968.

The spelling of 166115665 in words is "one hundred sixty-six million, one hundred fifteen thousand, six hundred sixty-five".