165663036 has 144 divisors (see below), whose sum is σ = 539831040. Its totient is φ = 43005600.

The previous prime is 165663031. The next prime is 165663077. The reversal of 165663036 is 630366561.

It is a happy number.

165663036 is a `hidden beast` number, since 16 + 5 + 6 + 630 + 3 + 6 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165663031) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 90571 + ... + 92381.

Almost surely, 2^165663036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165663036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269915520).

165663036 is an abundant number, since it is smaller than the sum of its proper divisors (374168004).

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

165663036 is a wasteful number, since it uses less digits than its factorization.

165663036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853 (or 1834 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 165663036 is about 12871.0153445639. The cubic root of 165663036 is about 549.2143449212.

The spelling of 165663036 in words is "one hundred sixty-five million, six hundred sixty-three thousand, thirty-six".