68181911999 has 2 divisors, whose sum is σ = 68181912000. Its totient is φ = 68181911998.

The previous prime is 68181911981. The next prime is 68181912037. The reversal of 68181911999 is 99911918186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68181911999 - 2¹² = 68181907903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68181911969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34090955999 + 34090956000.

It is an arithmetic number, because the mean of its divisors is an integer number (34090956000).

Almost surely, 2^68181911999 is an apocalyptic number.

68181911999 is a deficient number, since it is larger than the sum of its proper divisors (1).

68181911999 is an equidigital number, since it uses as much as digits as its factorization.

68181911999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 62.

The spelling of 68181911999 in words is "sixty-eight billion, one hundred eighty-one million, nine hundred eleven thousand, nine hundred ninety-nine".