165618252 has 18 divisors (see below), whose sum is σ = 418646228. Its totient is φ = 55206072.

The previous prime is 165618247. The next prime is 165618259. The reversal of 165618252 is 252816561.

165618252 is a `hidden beast` number, since 16 + 5 + 618 + 25 + 2 = 666.

165618252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 4600507 = 165618252 / (1 + 6 + 5 + 6 + 1 + 8 + 2 + 5 + 2).

It is not an unprimeable number, because it can be changed into a prime (165618259) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2300218 + ... + 2300289.

Almost surely, 2^165618252 is an apocalyptic number.

165618252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165618252 is an abundant number, since it is smaller than the sum of its proper divisors (253027976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165618252 is a wasteful number, since it uses less digits than its factorization.

165618252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4600517 (or 4600512 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 165618252 is about 12869.2755040834. The cubic root of 165618252 is about 549.1648504121.

The spelling of 165618252 in words is "one hundred sixty-five million, six hundred eighteen thousand, two hundred fifty-two".