165309055720 has 32 divisors (see below), whose sum is σ = 378042846120. Its totient is φ = 65039627520.

The previous prime is 165309055679. The next prime is 165309055721. The reversal of 165309055720 is 27550903561.

It can be written as a sum of positive squares in 4 ways, for example, as 86625439684 + 78683616036 = 294322^2 + 280506^2 .

It is not an unprimeable number, because it can be changed into a prime (165309055721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33872367 + ... + 33877246.

Almost surely, 2^165309055720 is an apocalyptic number.

165309055720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165309055720 is an abundant number, since it is smaller than the sum of its proper divisors (212733790400).

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

165309055720 is a wasteful number, since it uses less digits than its factorization.

165309055720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67749685 (or 67749681 counting only the distinct ones).

The product of its (nonzero) digits is 283500, while the sum is 43.

The spelling of 165309055720 in words is "one hundred sixty-five billion, three hundred nine million, fifty-five thousand, seven hundred twenty".