18219639311 has 2 divisors, whose sum is σ = 18219639312. Its totient is φ = 18219639310.

The previous prime is 18219639307. The next prime is 18219639323. The reversal of 18219639311 is 11393691281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18219639311 - 2² = 18219639307 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18219630311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109819655 + 9109819656.

It is an arithmetic number, because the mean of its divisors is an integer number (9109819656).

Almost surely, 2^18219639311 is an apocalyptic number.

18219639311 is a deficient number, since it is larger than the sum of its proper divisors (1).

18219639311 is an equidigital number, since it uses as much as digits as its factorization.

18219639311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 44.

The spelling of 18219639311 in words is "eighteen billion, two hundred nineteen million, six hundred thirty-nine thousand, three hundred eleven".