165669361 has 16 divisors (see below), whose sum is σ = 198313920. Its totient is φ = 136393920.

The previous prime is 165669349. The next prime is 165669401. The reversal of 165669361 is 163966561.

It is not a de Polignac number, because 165669361 - 2¹³ = 165661169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165669061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3351 + ... + 18508.

It is an arithmetic number, because the mean of its divisors is an integer number (12394620).

Almost surely, 2^165669361 is an apocalyptic number.

165669361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165669361 is a deficient number, since it is larger than the sum of its proper divisors (32644559).

165669361 is a wasteful number, since it uses less digits than its factorization.

165669361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21936.

The product of its digits is 174960, while the sum is 43.

The square root of 165669361 is about 12871.2610493300. The cubic root of 165669361 is about 549.2213344839.

It can be divided in two parts, 1656 and 69361, that added together give a palindrome (71017).

The spelling of 165669361 in words is "one hundred sixty-five million, six hundred sixty-nine thousand, three hundred sixty-one".