164815165 has 4 divisors (see below), whose sum is σ = 197778204. Its totient is φ = 131852128.

The previous prime is 164815163. The next prime is 164815169. The reversal of 164815165 is 561518461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561518461 = 7 ⋅80216923.

It can be written as a sum of positive squares in 2 ways, for example, as 42889401 + 121925764 = 6549^2 + 11042^2 .

It is a cyclic number.

It is not a de Polignac number, because 164815165 - 2¹ = 164815163 is a prime.

It is a super-2 number, since 2×164815165² = 54328077227954450, 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 (164815163) 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, 16481512 + ... + 16481521.

It is an arithmetic number, because the mean of its divisors is an integer number (49444551).

Almost surely, 2^164815165 is an apocalyptic number.

It is an amenable number.

164815165 is a deficient number, since it is larger than the sum of its proper divisors (32963039).

164815165 is an equidigital number, since it uses as much as digits as its factorization.

164815165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32963038.

The product of its digits is 28800, while the sum is 37.

The square root of 164815165 is about 12838.0358700231. The cubic root of 164815165 is about 548.2757738279.

The spelling of 164815165 in words is "one hundred sixty-four million, eight hundred fifteen thousand, one hundred sixty-five".