165252420185 has 8 divisors (see below), whose sum is σ = 198327383496. Its totient is φ = 132185616640.

The previous prime is 165252420169. The next prime is 165252420191. The reversal of 165252420185 is 581024252561.

It can be written as a sum of positive squares in 4 ways, for example, as 27976242121 + 137276178064 = 167261^2 + 370508^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165252420185 - 2⁴ = 165252420169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1995296 + ... + 2076465.

It is an arithmetic number, because the mean of its divisors is an integer number (24790922937).

Almost surely, 2^165252420185 is an apocalyptic number.

It is an amenable number.

165252420185 is a deficient number, since it is larger than the sum of its proper divisors (33074963311).

165252420185 is an equidigital number, since it uses as much as digits as its factorization.

165252420185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4079883.

The product of its (nonzero) digits is 192000, while the sum is 41.

The spelling of 165252420185 in words is "one hundred sixty-five billion, two hundred fifty-two million, four hundred twenty thousand, one hundred eighty-five".