16161165 has 12 divisors (see below), whose sum is σ = 28012764. Its totient is φ = 8619264.

The previous prime is 16161161. The next prime is 16161181. The reversal of 16161165 is 56116161.

It can be written as a sum of positive squares in 2 ways, for example, as 7322436 + 8838729 = 2706^2 + 2973^2 .

It is not a de Polignac number, because 16161165 - 2² = 16161161 is a prime.

It is a super-2 number, since 2×16161165² = 522366508314450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16161161) 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, 179524 + ... + 179613.

It is an arithmetic number, because the mean of its divisors is an integer number (2334397).

Almost surely, 2^16161165 is an apocalyptic number.

16161165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16161165 is a deficient number, since it is larger than the sum of its proper divisors (11851599).

16161165 is a wasteful number, since it uses less digits than its factorization.

16161165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359148 (or 359145 counting only the distinct ones).

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

The square root of 16161165 is about 4020.0951481277. The cubic root of 16161165 is about 252.8274482578.

The spelling of 16161165 in words is "sixteen million, one hundred sixty-one thousand, one hundred sixty-five".