165990000 has 200 divisors, whose sum is σ = 585712512. Its totient is φ = 40160000.

The previous prime is 165989987. The next prime is 165990037. The reversal of 165990000 is 99561.

165990000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (200).

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

It is a self number, because there is not a number n which added to its sum of digits gives 165990000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 329749 + ... + 330251.

Almost surely, 2^165990000 is an apocalyptic number.

165990000 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 165990000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292856256).

165990000 is an abundant number, since it is smaller than the sum of its proper divisors (419722512).

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

165990000 is a wasteful number, since it uses less digits than its factorization.

165990000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 165990000 is about 12883.7106456176. The cubic root of 165990000 is about 549.5754299151.

The spelling of 165990000 in words is "one hundred sixty-five million, nine hundred ninety thousand".