11999986668 has 72 divisors (see below), whose sum is σ = 31398861312. Its totient is φ = 3861188352.

The previous prime is 11999986643. The next prime is 11999986681. The reversal of 11999986668 is 86668999911.

It is a junction number, because it is equal to n+sod(n) for n = 11999986596 and 11999986605.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133696 + ... + 204632.

It is an arithmetic number, because the mean of its divisors is an integer number (436095296).

Almost surely, 2^11999986668 is an apocalyptic number.

11999986668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11999986668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15699430656).

11999986668 is an abundant number, since it is smaller than the sum of its proper divisors (19398874644).

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

11999986668 is a wasteful number, since it uses less digits than its factorization.

11999986668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71111 (or 71106 counting only the distinct ones).

The product of its digits is 90699264, while the sum is 72.

The spelling of 11999986668 in words is "eleven billion, nine hundred ninety-nine million, nine hundred eighty-six thousand, six hundred sixty-eight".