165455730 has 256 divisors, whose sum is σ = 531878400. Its totient is φ = 36126720.

The previous prime is 165455723. The next prime is 165455761. The reversal of 165455730 is 37554561.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1464154 + ... + 1464266.

It is an arithmetic number, because the mean of its divisors is an integer number (2077650).

Almost surely, 2^165455730 is an apocalyptic number.

165455730 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 165455730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265939200).

165455730 is an abundant number, since it is smaller than the sum of its proper divisors (366422670).

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

165455730 is a wasteful number, since it uses less digits than its factorization.

165455730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 165455730 is about 12862.9596127796. The cubic root of 165455730 is about 548.9851589048.

The spelling of 165455730 in words is "one hundred sixty-five million, four hundred fifty-five thousand, seven hundred thirty".