165256729 has 4 divisors (see below), whose sum is σ = 180280080. Its totient is φ = 150233380.

The previous prime is 165256723. The next prime is 165256739. The reversal of 165256729 is 927652561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 165256729 - 2⁷ = 165256601 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165256723) 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, 7511659 + ... + 7511680.

It is an arithmetic number, because the mean of its divisors is an integer number (45070020).

Almost surely, 2^165256729 is an apocalyptic number.

It is an amenable number.

165256729 is a deficient number, since it is larger than the sum of its proper divisors (15023351).

165256729 is a wasteful number, since it uses less digits than its factorization.

165256729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15023350.

The product of its digits is 226800, while the sum is 43.

The square root of 165256729 is about 12855.2218572843. The cubic root of 165256729 is about 548.7649742784.

The spelling of 165256729 in words is "one hundred sixty-five million, two hundred fifty-six thousand, seven hundred twenty-nine".