165580566 has 8 divisors (see below), whose sum is σ = 331161144. Its totient is φ = 55193520.

The previous prime is 165580559. The next prime is 165580589. The reversal of 165580566 is 665085561.

It is a sphenic number, since it is the product of 3 distinct primes.

165580566 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13798375 + ... + 13798386.

It is an arithmetic number, because the mean of its divisors is an integer number (41395143).

Almost surely, 2^165580566 is an apocalyptic number.

165580566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

165580566 is a wasteful number, since it uses less digits than its factorization.

165580566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27596766.

The product of its (nonzero) digits is 216000, while the sum is 42.

The square root of 165580566 is about 12867.8112357930. The cubic root of 165580566 is about 549.1231935773.

The spelling of 165580566 in words is "one hundred sixty-five million, five hundred eighty thousand, five hundred sixty-six".