16165165 has 4 divisors (see below), whose sum is σ = 19398204. Its totient is φ = 12932128.

The previous prime is 16165139. The next prime is 16165169. The reversal of 16165165 is 56156161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56156161 = 491 ⋅114371.

It can be written as a sum of positive squares in 2 ways, for example, as 2762244 + 13402921 = 1662^2 + 3661^2 .

It is a cyclic number.

It is not a de Polignac number, because 16165165 - 2¹⁵ = 16132397 is a prime.

It is a super-2 number, since 2×16165165² = 522625118954450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616512 + ... + 1616521.

It is an arithmetic number, because the mean of its divisors is an integer number (4849551).

Almost surely, 2^16165165 is an apocalyptic number.

It is an amenable number.

16165165 is a deficient number, since it is larger than the sum of its proper divisors (3233039).

16165165 is an equidigital number, since it uses as much as digits as its factorization.

16165165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233038.

The product of its digits is 5400, while the sum is 31.

The square root of 16165165 is about 4020.5926180104. The cubic root of 16165165 is about 252.8483053839.

The spelling of 16165165 in words is "sixteen million, one hundred sixty-five thousand, one hundred sixty-five".