166565550 has 48 divisors (see below), whose sum is σ = 413937792. Its totient is φ = 44325600.

The previous prime is 166565513. The next prime is 166565569. The reversal of 166565550 is 55565661.

It is a junction number, because it is equal to n+sod(n) for n = 166565499 and 166565508.

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 23 ways as a sum of consecutive naturals, for example, 102847 + ... + 104453.

It is an arithmetic number, because the mean of its divisors is an integer number (8623704).

Almost surely, 2^166565550 is an apocalyptic number.

166565550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166565550 is an abundant number, since it is smaller than the sum of its proper divisors (247372242).

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

166565550 is a wasteful number, since it uses less digits than its factorization.

166565550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313 (or 2308 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 166565550 is about 12906.0276615231. The cubic root of 166565550 is about 550.2098923420.

The spelling of 166565550 in words is "one hundred sixty-six million, five hundred sixty-five thousand, five hundred fifty".