165220722 has 60 divisors (see below), whose sum is σ = 393386730. Its totient is φ = 51819264.

The previous prime is 165220721. The next prime is 165220729. The reversal of 165220722 is 227022561.

165220722 is a `hidden beast` number, since 1 + 652 + 2 + 0 + 7 + 2 + 2 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 147403881 + 17816841 = 12141^2 + 4221^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (165220721) by changing a digit.

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 29 ways as a sum of consecutive naturals, for example, 45054 + ... + 48582.

Almost surely, 2^165220722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165220722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196693365).

165220722 is an abundant number, since it is smaller than the sum of its proper divisors (228166008).

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

165220722 is a wasteful number, since it uses less digits than its factorization.

165220722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3577 (or 3551 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 165220722 is about 12853.8212995202. The cubic root of 165220722 is about 548.7251154563.

The spelling of 165220722 in words is "one hundred sixty-five million, two hundred twenty thousand, seven hundred twenty-two".