165505550 has 48 divisors (see below), whose sum is σ = 355310592. Its totient is φ = 56181600.

The previous prime is 165505547. The next prime is 165505573. The reversal of 165505550 is 55505561.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33755 + ... + 38345.

It is an arithmetic number, because the mean of its divisors is an integer number (7402304).

Almost surely, 2^165505550 is an apocalyptic number.

165505550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165505550 is an abundant number, since it is smaller than the sum of its proper divisors (189805042).

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

165505550 is a wasteful number, since it uses less digits than its factorization.

165505550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4713 (or 4708 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 165505550 is about 12864.8960353358. The cubic root of 165505550 is about 549.0402546011.

The spelling of 165505550 in words is "one hundred sixty-five million, five hundred five thousand, five hundred fifty".