165809488 has 20 divisors (see below), whose sum is σ = 345968308. Its totient is φ = 76527360.

The previous prime is 165809437. The next prime is 165809489. The reversal of 165809488 is 884908561.

It can be written as a sum of positive squares in 2 ways, for example, as 27793984 + 138015504 = 5272^2 + 11748^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165809489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398373 + ... + 398788.

Almost surely, 2^165809488 is an apocalyptic number.

It is an amenable number.

165809488 is an abundant number, since it is smaller than the sum of its proper divisors (180158820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165809488 is a wasteful number, since it uses less digits than its factorization.

165809488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797182 (or 797176 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 49.

The square root of 165809488 is about 12876.7033048059. The cubic root of 165809488 is about 549.3761389073.

The spelling of 165809488 in words is "one hundred sixty-five million, eight hundred nine thousand, four hundred eighty-eight".