165432213 has 24 divisors (see below), whose sum is σ = 255813376. Its totient is φ = 106725600.

The previous prime is 165432209. The next prime is 165432227. The reversal of 165432213 is 312234561.

165432213 is a `hidden beast` number, since 1 + 654 + 3 + 2 + 2 + 1 + 3 = 666.

It is not a de Polignac number, because 165432213 - 2² = 165432209 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165432203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3448 + ... + 18513.

Almost surely, 2^165432213 is an apocalyptic number.

It is an amenable number.

165432213 is a deficient number, since it is larger than the sum of its proper divisors (90381163).

165432213 is an equidigital number, since it uses as much as digits as its factorization.

165432213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22007 (or 21995 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 165432213 is about 12862.0454438631. The cubic root of 165432213 is about 548.9591477261.

Adding to 165432213 its reverse (312234561), we get a palindrome (477666774).

The spelling of 165432213 in words is "one hundred sixty-five million, four hundred thirty-two thousand, two hundred thirteen".