165023665 has 8 divisors (see below), whose sum is σ = 198118440. Its totient is φ = 131958912.

The previous prime is 165023657. The next prime is 165023687. The reversal of 165023665 is 566320561.

It can be written as a sum of positive squares in 4 ways, for example, as 22268961 + 142754704 = 4719^2 + 11948^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165023665 - 2³ = 165023657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165023665.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7221 + ... + 19549.

It is an arithmetic number, because the mean of its divisors is an integer number (24764805).

Almost surely, 2^165023665 is an apocalyptic number.

It is an amenable number.

165023665 is a deficient number, since it is larger than the sum of its proper divisors (33094775).

165023665 is a wasteful number, since it uses less digits than its factorization.

165023665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15011.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 165023665 is about 12846.1537045140. The cubic root of 165023665 is about 548.5068757972.

The spelling of 165023665 in words is "one hundred sixty-five million, twenty-three thousand, six hundred sixty-five".