165507729 has 16 divisors (see below), whose sum is σ = 229000704. Its totient is φ = 106214400.

The previous prime is 165507721. The next prime is 165507737. The reversal of 165507729 is 927705561.

It is an interprime number because it is at equal distance from previous prime (165507721) and next prime (165507737).

It is not a de Polignac number, because 165507729 - 2³ = 165507721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165507721) 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, 13339 + ... + 22559.

It is an arithmetic number, because the mean of its divisors is an integer number (14312544).

Almost surely, 2^165507729 is an apocalyptic number.

It is an amenable number.

165507729 is a deficient number, since it is larger than the sum of its proper divisors (63492975).

165507729 is a wasteful number, since it uses less digits than its factorization.

165507729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9448.

The product of its (nonzero) digits is 132300, while the sum is 42.

The square root of 165507729 is about 12864.9807228771. The cubic root of 165507729 is about 549.0426640942.

The spelling of 165507729 in words is "one hundred sixty-five million, five hundred seven thousand, seven hundred twenty-nine".