165115656 has 24 divisors (see below), whose sum is σ = 447188430. Its totient is φ = 55038528.

The previous prime is 165115649. The next prime is 165115661. The reversal of 165115656 is 656511561.

It can be written as a sum of positive squares in only one way, i.e., 149670756 + 15444900 = 12234^2 + 3930^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 165115656.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1146565 + ... + 1146708.

Almost surely, 2^165115656 is an apocalyptic number.

It is an amenable number.

165115656 is an abundant number, since it is smaller than the sum of its proper divisors (282072774).

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

165115656 is a wasteful number, since it uses less digits than its factorization.

165115656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293285 (or 2293278 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 165115656 is about 12849.7336937386. The cubic root of 165115656 is about 548.6087769865.

The spelling of 165115656 in words is "one hundred sixty-five million, one hundred fifteen thousand, six hundred fifty-six".