18823123117 has 2 divisors, whose sum is σ = 18823123118. Its totient is φ = 18823123116.

The previous prime is 18823123103. The next prime is 18823123133. The reversal of 18823123117 is 71132132881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18787910761 + 35212356 = 137069^2 + 5934^2 .

It is an emirp because it is prime and its reverse (71132132881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18823123117 - 2¹⁹ = 18822598829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18823123817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9411561558 + 9411561559.

It is an arithmetic number, because the mean of its divisors is an integer number (9411561559).

Almost surely, 2^18823123117 is an apocalyptic number.

It is an amenable number.

18823123117 is a deficient number, since it is larger than the sum of its proper divisors (1).

18823123117 is an equidigital number, since it uses as much as digits as its factorization.

18823123117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

Adding to 18823123117 its reverse (71132132881), we get a palindrome (89955255998).

The spelling of 18823123117 in words is "eighteen billion, eight hundred twenty-three million, one hundred twenty-three thousand, one hundred seventeen".