161600504 has 96 divisors (see below), whose sum is σ = 355752000. Its totient is φ = 68530176.

The previous prime is 161600503. The next prime is 161600531. The reversal of 161600504 is 405006161.

161600504 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 2×161600504² = 52229445786108032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161600504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161600501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1815692 + ... + 1815780.

It is an arithmetic number, because the mean of its divisors is an integer number (3705750).

Almost surely, 2^161600504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161600504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177876000).

161600504 is an abundant number, since it is smaller than the sum of its proper divisors (194151496).

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

161600504 is a wasteful number, since it uses less digits than its factorization.

161600504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 161600504 is about 12712.2186891195. The cubic root of 161600504 is about 544.6877025721.

Adding to 161600504 its reverse (405006161), we get a palindrome (566606665).

The spelling of 161600504 in words is "one hundred sixty-one million, six hundred thousand, five hundred four".