18812127199 has 2 divisors, whose sum is σ = 18812127200. Its totient is φ = 18812127198.

The previous prime is 18812127197. The next prime is 18812127311. The reversal of 18812127199 is 99172121881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18812127199 - 2¹ = 18812127197 is a prime.

It is a super-2 number, since 2×18812127199² (a number of 21 digits) contains 22 as substring.

Together with 18812127197, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18812127197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9406063599 + 9406063600.

It is an arithmetic number, because the mean of its divisors is an integer number (9406063600).

Almost surely, 2^18812127199 is an apocalyptic number.

18812127199 is a deficient number, since it is larger than the sum of its proper divisors (1).

18812127199 is an equidigital number, since it uses as much as digits as its factorization.

18812127199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 49.

The spelling of 18812127199 in words is "eighteen billion, eight hundred twelve million, one hundred twenty-seven thousand, one hundred ninety-nine".