165373865 has 8 divisors (see below), whose sum is σ = 200414088. Its totient is φ = 130988800.

The previous prime is 165373861. The next prime is 165373903. The reversal of 165373865 is 568373561.

It can be written as a sum of positive squares in 4 ways, for example, as 113720896 + 51652969 = 10664^2 + 7187^2 .

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

It is not a de Polignac number, because 165373865 - 2² = 165373861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165373861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163232 + ... + 164241.

It is an arithmetic number, because the mean of its divisors is an integer number (25051761).

Almost surely, 2^165373865 is an apocalyptic number.

It is an amenable number.

165373865 is a deficient number, since it is larger than the sum of its proper divisors (35040223).

165373865 is a wasteful number, since it uses less digits than its factorization.

165373865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327579.

The product of its digits is 453600, while the sum is 44.

The square root of 165373865 is about 12859.7770198398. Note that the first 3 decimals coincide. The cubic root of 165373865 is about 548.8946007751.

It can be divided in two parts, 16537 and 3865, that added together give a palindrome (20402).

The spelling of 165373865 in words is "one hundred sixty-five million, three hundred seventy-three thousand, eight hundred sixty-five".