165676665 has 32 divisors (see below), whose sum is σ = 330494976. Its totient is φ = 68852160.

The previous prime is 165676607. The next prime is 165676699. The reversal of 165676665 is 566676561.

It is a happy number.

It is not a de Polignac number, because 165676665 - 2⁶ = 165676601 is a prime.

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, 70567 + ... + 72876.

It is an arithmetic number, because the mean of its divisors is an integer number (10327968).

Almost surely, 2^165676665 is an apocalyptic number.

165676665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165676665 is a deficient number, since it is larger than the sum of its proper divisors (164818311).

165676665 is a wasteful number, since it uses less digits than its factorization.

165676665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143469.

The product of its digits is 1360800, while the sum is 48.

The square root of 165676665 is about 12871.5447790854. The cubic root of 165676665 is about 549.2294056880.

It can be divided in two parts, 16567 and 6665, that added together give a palindrome (23232).

The spelling of 165676665 in words is "one hundred sixty-five million, six hundred seventy-six thousand, six hundred sixty-five".