161641168 has 60 divisors (see below), whose sum is σ = 358410220. Its totient is φ = 70189056.

The previous prime is 161641163. The next prime is 161641169. The reversal of 161641168 is 861146161.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 6190144 + 155451024 = 2488^2 + 12468^2 .

It is a super-2 number, since 2×161641168² = 52255734384808448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161641163) 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, 58768 + ... + 61456.

Almost surely, 2^161641168 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 161641168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179205110).

161641168 is an abundant number, since it is smaller than the sum of its proper divisors (196769052).

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

161641168 is a wasteful number, since it uses less digits than its factorization.

161641168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744 (or 2721 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 161641168 is about 12713.8179946073. The cubic root of 161641168 is about 544.7333858520.

The spelling of 161641168 in words is "one hundred sixty-one million, six hundred forty-one thousand, one hundred sixty-eight".