18818371667 has 2 divisors, whose sum is σ = 18818371668. Its totient is φ = 18818371666.

The previous prime is 18818371591. The next prime is 18818371669. The reversal of 18818371667 is 76617381881.

It is a strong prime.

It is an emirp because it is prime and its reverse (76617381881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18818371667 is a prime.

It is a super-3 number, since 3×18818371667³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 18818371669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18818371669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9409185833 + 9409185834.

It is an arithmetic number, because the mean of its divisors is an integer number (9409185834).

Almost surely, 2^18818371667 is an apocalyptic number.

18818371667 is a deficient number, since it is larger than the sum of its proper divisors (1).

18818371667 is an equidigital number, since it uses as much as digits as its factorization.

18818371667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 56.

The spelling of 18818371667 in words is "eighteen billion, eight hundred eighteen million, three hundred seventy-one thousand, six hundred sixty-seven".