18939868327 has 2 divisors, whose sum is σ = 18939868328. Its totient is φ = 18939868326.

The previous prime is 18939868253. The next prime is 18939868331. The reversal of 18939868327 is 72386893981.

It is a strong prime.

It is an emirp because it is prime and its reverse (72386893981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18939868327 is a prime.

It is a super-2 number, since 2×18939868327² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18939868127) 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, 9469934163 + 9469934164.

It is an arithmetic number, because the mean of its divisors is an integer number (9469934164).

Almost surely, 2^18939868327 is an apocalyptic number.

18939868327 is a deficient number, since it is larger than the sum of its proper divisors (1).

18939868327 is an equidigital number, since it uses as much as digits as its factorization.

18939868327 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31352832, while the sum is 64.

The spelling of 18939868327 in words is "eighteen billion, nine hundred thirty-nine million, eight hundred sixty-eight thousand, three hundred twenty-seven".