66668888889999 has 32 divisors (see below), whose sum is σ = 107836235297280. Its totient is φ = 40372186176000.

The previous prime is 66668888889991. The next prime is 66668888890001. The reversal of 66668888889999 is 99998888886666.

It is not a de Polignac number, because 66668888889999 - 2³ = 66668888889991 is a prime.

66668888889999 is a strobogrammatic number because it is the same when read upside-down.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66668888889999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66668888889991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91863027 + ... + 92585924.

It is an arithmetic number, because the mean of its divisors is an integer number (3369882353040).

Almost surely, 2^{66668888889999} is an apocalyptic number.

66668888889999 is a deficient number, since it is larger than the sum of its proper divisors (41167346407281).

66668888889999 is a wasteful number, since it uses less digits than its factorization.

66668888889999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184450188 (or 184450182 counting only the distinct ones).

The product of its digits is 2229025112064, while the sum is 108.

The spelling of 66668888889999 in words is "sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, eight hundred eighty-nine thousand, nine hundred ninety-nine".