165655000 has 80 divisors (see below), whose sum is σ = 443670480. Its totient is φ = 56784000.

The previous prime is 165654967. The next prime is 165655019. The reversal of 165655000 is 556561.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 165655000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32634 + ... + 37366.

It is an arithmetic number, because the mean of its divisors is an integer number (5545881).

Almost surely, 2^165655000 is an apocalyptic number.

165655000 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 165655000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221835240).

165655000 is an abundant number, since it is smaller than the sum of its proper divisors (278015480).

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

165655000 is an equidigital number, since it uses as much as digits as its factorization.

165655000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766 (or 4747 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 165655000 is about 12870.7031664941. The cubic root of 165655000 is about 549.2054643285.

The spelling of 165655000 in words is "one hundred sixty-five million, six hundred fifty-five thousand".