165061220 has 12 divisors (see below), whose sum is σ = 346628604. Its totient is φ = 66024480.

The previous prime is 165061213. The next prime is 165061231. The reversal of 165061220 is 22160561.

It can be written as a sum of positive squares in 2 ways, for example, as 87198244 + 77862976 = 9338^2 + 8824^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4126511 + ... + 4126550.

It is an arithmetic number, because the mean of its divisors is an integer number (28885717).

Almost surely, 2^165061220 is an apocalyptic number.

165061220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165061220 is an abundant number, since it is smaller than the sum of its proper divisors (181567384).

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

165061220 is a wasteful number, since it uses less digits than its factorization.

165061220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8253070 (or 8253068 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 165061220 is about 12847.6153429343. The cubic root of 165061220 is about 548.5484811700.

The spelling of 165061220 in words is "one hundred sixty-five million, sixty-one thousand, two hundred twenty".