165572220 has 48 divisors (see below), whose sum is σ = 505749888. Its totient is φ = 40138560.

The previous prime is 165572203. The next prime is 165572221. The reversal of 165572220 is 22275561.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165572221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124774 + ... + 126093.

It is an arithmetic number, because the mean of its divisors is an integer number (10536456).

Almost surely, 2^165572220 is an apocalyptic number.

165572220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165572220 is an abundant number, since it is smaller than the sum of its proper divisors (340177668).

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

165572220 is a wasteful number, since it uses less digits than its factorization.

165572220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250890 (or 250888 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 165572220 is about 12867.4869341298. The cubic root of 165572220 is about 549.1139673352.

The spelling of 165572220 in words is "one hundred sixty-five million, five hundred seventy-two thousand, two hundred twenty".