165564210 has 64 divisors (see below), whose sum is σ = 458203392. Its totient is φ = 37502976.

The previous prime is 165564197. The next prime is 165564251. The reversal of 165564210 is 12465561.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20242 + ... + 27218.

It is an arithmetic number, because the mean of its divisors is an integer number (7159428).

Almost surely, 2^165564210 is an apocalyptic number.

165564210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 165564210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229101696).

165564210 is an abundant number, since it is smaller than the sum of its proper divisors (292639182).

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

165564210 is a wasteful number, since it uses less digits than its factorization.

165564210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 165564210 is about 12867.1756807778. The cubic root of 165564210 is about 549.1051122390.

The spelling of 165564210 in words is "one hundred sixty-five million, five hundred sixty-four thousand, two hundred ten".