165256305 has 16 divisors (see below), whose sum is σ = 268033920. Its totient is φ = 86928768.

The previous prime is 165256271. The next prime is 165256309. The reversal of 165256305 is 503652561.

It is not a de Polignac number, because 165256305 - 2¹² = 165252209 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (165256309) 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, 74365 + ... + 76554.

It is an arithmetic number, because the mean of its divisors is an integer number (16752120).

Almost surely, 2^165256305 is an apocalyptic number.

165256305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165256305 is a deficient number, since it is larger than the sum of its proper divisors (102777615).

165256305 is a wasteful number, since it uses less digits than its factorization.

165256305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151000.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 165256305 is about 12855.2053659208. The cubic root of 165256305 is about 548.7645049551.

It can be divided in two parts, 165256 and 305, that added together give a palindrome (165561).

The spelling of 165256305 in words is "one hundred sixty-five million, two hundred fifty-six thousand, three hundred five".