165531804736 has 21 divisors (see below), whose sum is σ = 328483633989. Its totient is φ = 82764274944.

The previous prime is 165531804733. The next prime is 165531804749. The reversal of 165531804736 is 637408135561.

The square root of 165531804736 is 406856.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7878337600 + 157653467136 = 88760^2 + 397056^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165531804736.

It is not an unprimeable number, because it can be changed into a prime (165531804733) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3229420 + ... + 3280276.

It is an arithmetic number, because the mean of its divisors is an integer number (15642077809).

Almost surely, 2^165531804736 is an apocalyptic number.

165531804736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

165531804736 is the 406856-th square number.

It is an amenable number.

165531804736 is a deficient number, since it is larger than the sum of its proper divisors (162951829253).

165531804736 is an frugal number, since it uses more digits than its factorization.

165531804736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101726 (or 50859 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 49.

Multiplying 165531804736 by its sum of digits (49), we get a square (8111058432064 = 2847992²).

The spelling of 165531804736 in words is "one hundred sixty-five billion, five hundred thirty-one million, eight hundred four thousand, seven hundred thirty-six".