11999986681 has 2 divisors, whose sum is σ = 11999986682. Its totient is φ = 11999986680.

The previous prime is 11999986643. The next prime is 11999986697. The reversal of 11999986681 is 18668999911.

11999986681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11786359225 + 213627456 = 108565^2 + 14616^2 .

It is a cyclic number.

It is not a de Polignac number, because 11999986681 - 2⁷ = 11999986553 is a prime.

It is a super-2 number, since 2×11999986681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11999986981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5999993340 + 5999993341.

It is an arithmetic number, because the mean of its divisors is an integer number (5999993341).

Almost surely, 2^11999986681 is an apocalyptic number.

It is an amenable number.

11999986681 is a deficient number, since it is larger than the sum of its proper divisors (1).

11999986681 is an equidigital number, since it uses as much as digits as its factorization.

11999986681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15116544, while the sum is 67.

The spelling of 11999986681 in words is "eleven billion, nine hundred ninety-nine million, nine hundred eighty-six thousand, six hundred eighty-one".