161585504 has 24 divisors (see below), whose sum is σ = 318722040. Its totient is φ = 80640256.

The previous prime is 161585497. The next prime is 161585509. The reversal of 161585504 is 405585161.

It is a happy number.

161585504 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161585504² = 52219750205868032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161585509) 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, 13532 + ... + 22500.

It is an arithmetic number, because the mean of its divisors is an integer number (13280085).

Almost surely, 2^161585504 is an apocalyptic number.

It is an amenable number.

161585504 is a deficient number, since it is larger than the sum of its proper divisors (157136536).

161585504 is an equidigital number, since it uses as much as digits as its factorization.

161585504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9542 (or 9534 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 35.

The square root of 161585504 is about 12711.6286918711. The cubic root of 161585504 is about 544.6708491421.

The spelling of 161585504 in words is "one hundred sixty-one million, five hundred eighty-five thousand, five hundred four".