181121668 has 24 divisors (see below), whose sum is σ = 390108992. Its totient is φ = 71652384.

The previous prime is 181121663. The next prime is 181121669. The reversal of 181121668 is 866121181.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (181121663) 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 7 ways as a sum of consecutive naturals, for example, 248430 + ... + 249157.

Almost surely, 2^181121668 is an apocalyptic number.

It is an amenable number.

181121668 is an abundant number, since it is smaller than the sum of its proper divisors (208987324).

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

181121668 is a wasteful number, since it uses less digits than its factorization.

181121668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497611 (or 497609 counting only the distinct ones).

The product of its digits is 4608, while the sum is 34.

The square root of 181121668 is about 13458.1450430585. The cubic root of 181121668 is about 565.7920007192.

The spelling of 181121668 in words is "one hundred eighty-one million, one hundred twenty-one thousand, six hundred sixty-eight".