165220620 has 96 divisors (see below), whose sum is σ = 501355008. Its totient is φ = 40492032.

The previous prime is 165220619. The next prime is 165220633. The reversal of 165220620 is 26022561.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41977 + ... + 45743.

It is an arithmetic number, because the mean of its divisors is an integer number (5222448).

Almost surely, 2^165220620 is an apocalyptic number.

165220620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165220620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250677504).

165220620 is an abundant number, since it is smaller than the sum of its proper divisors (336134388).

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

165220620 is a wasteful number, since it uses less digits than its factorization.

165220620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3839 (or 3837 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 165220620 is about 12853.8173318279. The cubic root of 165220620 is about 548.7250025367.

The spelling of 165220620 in words is "one hundred sixty-five million, two hundred twenty thousand, six hundred twenty".