666611111119999 has 4 divisors (see below), whose sum is σ = 666640914473664. Its totient is φ = 666581307766336.

The previous prime is 666611111119997. The next prime is 666611111120041. The reversal of 666611111119999 is 999911111116666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666611111119999 - 2¹ = 666611111119997 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

666611111119999 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666611111119991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14901643282 + ... + 14901688015.

It is an arithmetic number, because the mean of its divisors is an integer number (166660228618416).

Almost surely, 2^{666611111119999} is an apocalyptic number.

666611111119999 is a deficient number, since it is larger than the sum of its proper divisors (29803353665).

666611111119999 is a wasteful number, since it uses less digits than its factorization.

666611111119999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29803353664.

The product of its digits is 8503056, while the sum is 67.

The spelling of 666611111119999 in words is "six hundred sixty-six trillion, six hundred eleven billion, one hundred eleven million, one hundred nineteen thousand, nine hundred ninety-nine".