165783965 has 4 divisors (see below), whose sum is σ = 198940764. Its totient is φ = 132627168.

The previous prime is 165783941. The next prime is 165783967. The reversal of 165783965 is 569387561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126270169 + 39513796 = 11237^2 + 6286^2 .

It is a cyclic number.

It is not a de Polignac number, because 165783965 - 2¹⁶ = 165718429 is a prime.

It is a super-2 number, since 2×165783965² = 54968646102242450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165783967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16578392 + ... + 16578401.

It is an arithmetic number, because the mean of its divisors is an integer number (49735191).

Almost surely, 2^165783965 is an apocalyptic number.

It is an amenable number.

165783965 is a deficient number, since it is larger than the sum of its proper divisors (33156799).

165783965 is an equidigital number, since it uses as much as digits as its factorization.

165783965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33156798.

The product of its digits is 1360800, while the sum is 50.

The square root of 165783965 is about 12875.7122133108. The cubic root of 165783965 is about 549.3479490314.

The spelling of 165783965 in words is "one hundred sixty-five million, seven hundred eighty-three thousand, nine hundred sixty-five".