165921036 has 48 divisors (see below), whose sum is σ = 395539200. Its totient is φ = 54120640.

The previous prime is 165921031. The next prime is 165921073. The reversal of 165921036 is 630129561.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 165920988 and 165921006.

It is not an unprimeable number, because it can be changed into a prime (165921031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126295 + ... + 127601.

It is an arithmetic number, because the mean of its divisors is an integer number (8240400).

Almost surely, 2^165921036 is an apocalyptic number.

It is an amenable number.

165921036 is an abundant number, since it is smaller than the sum of its proper divisors (229618164).

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

165921036 is a wasteful number, since it uses less digits than its factorization.

165921036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534 (or 1532 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 165921036 is about 12881.0339647095. The cubic root of 165921036 is about 549.4993085221.

The spelling of 165921036 in words is "one hundred sixty-five million, nine hundred twenty-one thousand, thirty-six".