165681166 has 16 divisors (see below), whose sum is σ = 284244480. Its totient is φ = 70951320.

The previous prime is 165681101. The next prime is 165681169. The reversal of 165681166 is 661186561.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165681169) 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, 18031 + ... + 25621.

It is an arithmetic number, because the mean of its divisors is an integer number (17765280).

Almost surely, 2^165681166 is an apocalyptic number.

165681166 is a deficient number, since it is larger than the sum of its proper divisors (118563314).

165681166 is a wasteful number, since it uses less digits than its factorization.

165681166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9159.

The product of its digits is 51840, while the sum is 40.

The square root of 165681166 is about 12871.7196209364. The cubic root of 165681166 is about 549.2343793499.

The spelling of 165681166 in words is "one hundred sixty-five million, six hundred eighty-one thousand, one hundred sixty-six".