165550000 has 240 divisors, whose sum is σ = 511467264. Its totient is φ = 50400000.

The previous prime is 165549991. The next prime is 165550001. The reversal of 165550000 is 55561.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (165550001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3849979 + ... + 3850021.

Almost surely, 2^165550000 is an apocalyptic number.

165550000 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 165550000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255733632).

165550000 is an abundant number, since it is smaller than the sum of its proper divisors (345917264).

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

165550000 is an equidigital number, since it uses as much as digits as its factorization.

165550000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 165550000 is about 12866.6234887013. The cubic root of 165550000 is about 549.0894023081.

The spelling of 165550000 in words is "one hundred sixty-five million, five hundred fifty thousand".