188863992681 has 32 divisors (see below), whose sum is σ = 316524945408. Its totient is φ = 97500974400.

The previous prime is 188863992673. The next prime is 188863992701. The reversal of 188863992681 is 186299368881.

It is not a de Polignac number, because 188863992681 - 2³ = 188863992673 is a prime.

It is a super-2 number, since 2×188863992681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (188863992661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7346845 + ... + 7372506.

It is an arithmetic number, because the mean of its divisors is an integer number (9891404544).

Almost surely, 2^188863992681 is an apocalyptic number.

It is an amenable number.

188863992681 is a deficient number, since it is larger than the sum of its proper divisors (127660952727).

188863992681 is a wasteful number, since it uses less digits than its factorization.

188863992681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14719421.

The product of its digits is 71663616, while the sum is 69.

The spelling of 188863992681 in words is "one hundred eighty-eight billion, eight hundred sixty-three million, nine hundred ninety-two thousand, six hundred eighty-one".