165381722 has 16 divisors (see below), whose sum is σ = 279957600. Its totient is φ = 72581040.

The previous prime is 165381721. The next prime is 165381787. The reversal of 165381722 is 227183561.

It is a happy number.

It is a super-2 number, since 2×165381722² = 54702227943370568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165381721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128972 + ... + 130247.

It is an arithmetic number, because the mean of its divisors is an integer number (17497350).

Almost surely, 2^165381722 is an apocalyptic number.

165381722 is a deficient number, since it is larger than the sum of its proper divisors (114575878).

165381722 is a wasteful number, since it uses less digits than its factorization.

165381722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259261.

The product of its digits is 20160, while the sum is 35.

The square root of 165381722 is about 12860.0825036234. The cubic root of 165381722 is about 548.9032933953.

The spelling of 165381722 in words is "one hundred sixty-five million, three hundred eighty-one thousand, seven hundred twenty-two".