165739745 has 16 divisors (see below), whose sum is σ = 205982352. Its totient is φ = 127944960.

The previous prime is 165739697. The next prime is 165739747. The reversal of 165739745 is 547937561.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 34774609 + 130965136 = 5897^2 + 11444^2 .

It is not a de Polignac number, because 165739745 - 2²⁰ = 164691169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165739745.

It is not an unprimeable number, because it can be changed into a prime (165739747) 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, 11039 + ... + 21291.

It is an arithmetic number, because the mean of its divisors is an integer number (12873897).

Almost surely, 2^165739745 is an apocalyptic number.

It is an amenable number.

165739745 is a deficient number, since it is larger than the sum of its proper divisors (40242607).

165739745 is a wasteful number, since it uses less digits than its factorization.

165739745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10372.

The product of its digits is 793800, while the sum is 47.

The square root of 165739745 is about 12873.9949122252. The cubic root of 165739745 is about 549.2991016726.

The spelling of 165739745 in words is "one hundred sixty-five million, seven hundred thirty-nine thousand, seven hundred forty-five".