165555065550 has 48 divisors (see below), whose sum is σ = 469230360192. Its totient is φ = 37841157600.

The previous prime is 165555065549. The next prime is 165555065563. The reversal of 165555065550 is 55560555561.

It is a self number, because there is not a number n which added to its sum of digits gives 165555065550.

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, 78834696 + ... + 78836795.

It is an arithmetic number, because the mean of its divisors is an integer number (9775632504).

Almost surely, 2^165555065550 is an apocalyptic number.

165555065550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165555065550 is an abundant number, since it is smaller than the sum of its proper divisors (303675294642).

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

165555065550 is a wasteful number, since it uses less digits than its factorization.

165555065550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157671513 (or 157671508 counting only the distinct ones).

The product of its (nonzero) digits is 2812500, while the sum is 48.

The spelling of 165555065550 in words is "one hundred sixty-five billion, five hundred fifty-five million, sixty-five thousand, five hundred fifty".