165165560 has 32 divisors (see below), whose sum is σ = 424712160. Its totient is φ = 56628096.

The previous prime is 165165541. The next prime is 165165571. The reversal of 165165560 is 65561561.

It is a super-2 number, since 2×165165560² = 54559324420227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 165165560.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294659 + ... + 295218.

It is an arithmetic number, because the mean of its divisors is an integer number (13272255).

Almost surely, 2^165165560 is an apocalyptic number.

165165560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165165560 is an abundant number, since it is smaller than the sum of its proper divisors (259546600).

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

165165560 is a wasteful number, since it uses less digits than its factorization.

165165560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589895 (or 589891 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 165165560 is about 12851.6753771639. The cubic root of 165165560 is about 548.6640413092.

The spelling of 165165560 in words is "one hundred sixty-five million, one hundred sixty-five thousand, five hundred sixty".