165432220 has 12 divisors (see below), whose sum is σ = 347407704. Its totient is φ = 66172880.

The previous prime is 165432209. The next prime is 165432227. The reversal of 165432220 is 22234561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165432227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4135786 + ... + 4135825.

It is an arithmetic number, because the mean of its divisors is an integer number (28950642).

Almost surely, 2^165432220 is an apocalyptic number.

165432220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165432220 is an abundant number, since it is smaller than the sum of its proper divisors (181975484).

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

165432220 is a wasteful number, since it uses less digits than its factorization.

165432220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8271620 (or 8271618 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 165432220 is about 12862.0457159816. The cubic root of 165432220 is about 548.9591554689.

Adding to 165432220 its reverse (22234561), we get a palindrome (187666781).

It can be divided in two parts, 16 and 5432220, that multiplied together give a triangular number (86915520 = T₁₃₁₈₄).

The spelling of 165432220 in words is "one hundred sixty-five million, four hundred thirty-two thousand, two hundred twenty".