165644255 has 12 divisors (see below), whose sum is σ = 231226200. Its totient is φ = 113584464.

The previous prime is 165644249. The next prime is 165644257. The reversal of 165644255 is 552446561.

It is not a de Polignac number, because 165644255 - 2¹⁸ = 165382111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165644257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 337805 + ... + 338294.

It is an arithmetic number, because the mean of its divisors is an integer number (19268850).

Almost surely, 2^165644255 is an apocalyptic number.

165644255 is a deficient number, since it is larger than the sum of its proper divisors (65581945).

165644255 is an equidigital number, since it uses as much as digits as its factorization.

165644255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676118 (or 676111 counting only the distinct ones).

The product of its digits is 144000, while the sum is 38.

The square root of 165644255 is about 12870.2857388638. The cubic root of 165644255 is about 549.1935895681.

The spelling of 165644255 in words is "one hundred sixty-five million, six hundred forty-four thousand, two hundred fifty-five".