191666666666668 has 24 divisors (see below), whose sum is σ = 336403875200400. Its totient is φ = 95551307563008.

The previous prime is 191666666666663. The next prime is 191666666666749. The reversal of 191666666666668 is 866666666666191.

It is a super-2 number, since 2×191666666666668² (a number of 29 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (85) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (191666666666663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18502188 + ... + 26938156.

It is an arithmetic number, because the mean of its divisors is an integer number (14016828133350).

Almost surely, 2^{191666666666668} is an apocalyptic number.

It is an amenable number.

191666666666668 is a deficient number, since it is larger than the sum of its proper divisors (144737208533732).

191666666666668 is a wasteful number, since it uses less digits than its factorization.

191666666666668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8452689 (or 8452687 counting only the distinct ones).

The product of its digits is 26121388032, while the sum is 85.

The spelling of 191666666666668 in words is "one hundred ninety-one trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-eight".