165101661 has 12 divisors (see below), whose sum is σ = 238729660. Its totient is φ = 109952640.

The previous prime is 165101641. The next prime is 165101681. The reversal of 165101661 is 166101561.

165101661 is a `hidden beast` number, since 1 + 651 + 0 + 1 + 6 + 6 + 1 = 666.

165101661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (165101641) and next prime (165101681).

It can be written as a sum of positive squares in 2 ways, for example, as 111957561 + 53144100 = 10581^2 + 7290^2 .

It is not a de Polignac number, because 165101661 - 2⁶ = 165101597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165101641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10 + ... + 18171.

Almost surely, 2^165101661 is an apocalyptic number.

It is an amenable number.

165101661 is a deficient number, since it is larger than the sum of its proper divisors (73627999).

165101661 is a wasteful number, since it uses less digits than its factorization.

165101661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19196 (or 19193 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 165101661 is about 12849.1891183841. The cubic root of 165101661 is about 548.5932767468.

The spelling of 165101661 in words is "one hundred sixty-five million, one hundred one thousand, six hundred sixty-one".