165255550 has 12 divisors (see below), whose sum is σ = 307375416. Its totient is φ = 66102200.

The previous prime is 165255547. The next prime is 165255593. The reversal of 165255550 is 55552561.

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 5 ways as a sum of consecutive naturals, for example, 1652506 + ... + 1652605.

It is an arithmetic number, because the mean of its divisors is an integer number (25614618).

Almost surely, 2^165255550 is an apocalyptic number.

165255550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165255550 is a deficient number, since it is larger than the sum of its proper divisors (142119866).

165255550 is a wasteful number, since it uses less digits than its factorization.

165255550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305123 (or 3305118 counting only the distinct ones).

The product of its (nonzero) digits is 37500, while the sum is 34.

The square root of 165255550 is about 12855.1760003510. The cubic root of 165255550 is about 548.7636692475.

The spelling of 165255550 in words is "one hundred sixty-five million, two hundred fifty-five thousand, five hundred fifty".