11188198681 has 32 divisors (see below), whose sum is σ = 12635504640. Its totient is φ = 9818928000.

The previous prime is 11188198669. The next prime is 11188198699. The reversal of 11188198681 is 18689188111.

It is a cyclic number.

It is not a de Polignac number, because 11188198681 - 2²⁹ = 10651327769 is a prime.

It is a super-2 number, since 2×11188198681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11188198601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27354805 + ... + 27355213.

It is an arithmetic number, because the mean of its divisors is an integer number (394859520).

Almost surely, 2^11188198681 is an apocalyptic number.

11188198681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11188198681 is a deficient number, since it is larger than the sum of its proper divisors (1447305959).

11188198681 is a wasteful number, since it uses less digits than its factorization.

11188198681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997.

The product of its digits is 221184, while the sum is 52.

The spelling of 11188198681 in words is "eleven billion, one hundred eighty-eight million, one hundred ninety-eight thousand, six hundred eighty-one".