188681809168 has 10 divisors (see below), whose sum is σ = 365571005294. Its totient is φ = 94340904576.

The previous prime is 188681809139. The next prime is 188681809187. The reversal of 188681809168 is 861908186881.

It can be written as a sum of positive squares in only one way, i.e., 182147996944 + 6533812224 = 426788^2 + 80832^2 .

It is a super-2 number, since 2×188681809168² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5896306521 + ... + 5896306552.

Almost surely, 2^188681809168 is an apocalyptic number.

It is an amenable number.

188681809168 is a deficient number, since it is larger than the sum of its proper divisors (176889196126).

188681809168 is a wasteful number, since it uses less digits than its factorization.

188681809168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11792613081 (or 11792613075 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 64.

The spelling of 188681809168 in words is "one hundred eighty-eight billion, six hundred eighty-one million, eight hundred nine thousand, one hundred sixty-eight".