161168644 has 72 divisors (see below), whose sum is σ = 361794048. Its totient is φ = 62233920.

The previous prime is 161168639. The next prime is 161168647. The reversal of 161168644 is 446861161.

Its product of digits (27648) is a multiple of the sum of its prime divisors (1536).

It is not an unprimeable number, because it can be changed into a prime (161168647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108829 + ... + 110299.

Almost surely, 2^161168644 is an apocalyptic number.

161168644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161168644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180897024).

161168644 is an abundant number, since it is smaller than the sum of its proper divisors (200625404).

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

161168644 is a wasteful number, since it uses less digits than its factorization.

161168644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545 (or 1536 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 161168644 is about 12695.2213056725. The cubic root of 161168644 is about 544.2020632366.

The spelling of 161168644 in words is "one hundred sixty-one million, one hundred sixty-eight thousand, six hundred forty-four".