18668368516667 has 4 divisors (see below), whose sum is σ = 19020601884960. Its totient is φ = 18316135148376.

The previous prime is 18668368516663. The next prime is 18668368516691. The reversal of 18668368516667 is 76661586386681.

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 18668368516667 - 2² = 18668368516663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18668368516661) 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, 176116684067 + ... + 176116684172.

It is an arithmetic number, because the mean of its divisors is an integer number (4755150471240).

Almost surely, 2^{18668368516667} is an apocalyptic number.

18668368516667 is a deficient number, since it is larger than the sum of its proper divisors (352233368293).

18668368516667 is an equidigital number, since it uses as much as digits as its factorization.

18668368516667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352233368292.

The product of its digits is 2508226560, while the sum is 77.

The spelling of 18668368516667 in words is "eighteen trillion, six hundred sixty-eight billion, three hundred sixty-eight million, five hundred sixteen thousand, six hundred sixty-seven".