165110661 has 12 divisors (see below), whose sum is σ = 239111340. Its totient is φ = 109788480.

The previous prime is 165110651. The next prime is 165110663. The reversal of 165110661 is 166011561.

165110661 is a `hidden beast` number, since 1 + 651 + 1 + 0 + 6 + 6 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31708161 + 133402500 = 5631^2 + 11550^2 .

It is a de Polignac number, because none of the positive numbers 2^k-165110661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165110663) 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, 20080 + ... + 27081.

It is an arithmetic number, because the mean of its divisors is an integer number (19925945).

Almost surely, 2^165110661 is an apocalyptic number.

It is an amenable number.

165110661 is a deficient number, since it is larger than the sum of its proper divisors (74000679).

165110661 is a wasteful number, since it uses less digits than its factorization.

165110661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47556 (or 47553 counting only the distinct ones).

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

The square root of 165110661 is about 12849.5393302639. The cubic root of 165110661 is about 548.6032448471.

The spelling of 165110661 in words is "one hundred sixty-five million, one hundred ten thousand, six hundred sixty-one".