18811699219 has 2 divisors, whose sum is σ = 18811699220. Its totient is φ = 18811699218.

The previous prime is 18811699199. The next prime is 18811699237. The reversal of 18811699219 is 91299611881.

It is a strong prime.

It is an emirp because it is prime and its reverse (91299611881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18811699219 - 2⁵ = 18811699187 is a prime.

It is a super-2 number, since 2×18811699219² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18811699219.

It is not a weakly prime, because it can be changed into another prime (18811699619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9405849609 + 9405849610.

It is an arithmetic number, because the mean of its divisors is an integer number (9405849610).

Almost surely, 2^18811699219 is an apocalyptic number.

18811699219 is a deficient number, since it is larger than the sum of its proper divisors (1).

18811699219 is an equidigital number, since it uses as much as digits as its factorization.

18811699219 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 55.

The spelling of 18811699219 in words is "eighteen billion, eight hundred eleven million, six hundred ninety-nine thousand, two hundred nineteen".