18838673813 has 2 divisors, whose sum is σ = 18838673814. Its totient is φ = 18838673812.

The previous prime is 18838673807. The next prime is 18838673921. The reversal of 18838673813 is 31837683881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11993097169 + 6845576644 = 109513^2 + 82738^2 .

It is a cyclic number.

It is not a de Polignac number, because 18838673813 - 2¹⁴ = 18838657429 is a prime.

It is a super-2 number, since 2×18838673813² (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 (18838673213) 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, 9419336906 + 9419336907.

It is an arithmetic number, because the mean of its divisors is an integer number (9419336907).

Almost surely, 2^18838673813 is an apocalyptic number.

It is an amenable number.

18838673813 is a deficient number, since it is larger than the sum of its proper divisors (1).

18838673813 is an equidigital number, since it uses as much as digits as its factorization.

18838673813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 56.

The spelling of 18838673813 in words is "eighteen billion, eight hundred thirty-eight million, six hundred seventy-three thousand, eight hundred thirteen".