16165161 has 6 divisors (see below), whose sum is σ = 23349690. Its totient is φ = 10776768.

The previous prime is 16165139. The next prime is 16165169. The reversal of 16165161 is 16156161.

16165161 is a `hidden beast` number, since 1 + 6 + 1 + 651 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16160400 + 4761 = 4020^2 + 69^2 .

It is not a de Polignac number, because 16165161 - 2¹¹ = 16163113 is a prime.

It is a super-2 number, since 2×16165161² = 522624860311842, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16165169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 898056 + ... + 898073.

It is an arithmetic number, because the mean of its divisors is an integer number (3891615).

Almost surely, 2^16165161 is an apocalyptic number.

It is an amenable number.

16165161 is a deficient number, since it is larger than the sum of its proper divisors (7184529).

16165161 is a wasteful number, since it uses less digits than its factorization.

16165161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796135 (or 1796132 counting only the distinct ones).

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

The square root of 16165161 is about 4020.5921205713. The cubic root of 16165161 is about 252.8482845285.

The spelling of 16165161 in words is "sixteen million, one hundred sixty-five thousand, one hundred sixty-one".