165328738536 has 128 divisors (see below), whose sum is σ = 461033395200. Its totient is φ = 49113969408.

The previous prime is 165328738517. The next prime is 165328738543. The reversal of 165328738536 is 635837823561.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7598505 + ... + 7620231.

It is an arithmetic number, because the mean of its divisors is an integer number (3601823400).

Almost surely, 2^165328738536 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 165328738536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230516697600).

165328738536 is an abundant number, since it is smaller than the sum of its proper divisors (295704656664).

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

165328738536 is a wasteful number, since it uses less digits than its factorization.

165328738536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21836 (or 21774 counting only the distinct ones).

The product of its digits is 21772800, while the sum is 57.

The spelling of 165328738536 in words is "one hundred sixty-five billion, three hundred twenty-eight million, seven hundred thirty-eight thousand, five hundred thirty-six".