18723299838931 has 2 divisors, whose sum is σ = 18723299838932. Its totient is φ = 18723299838930.

The previous prime is 18723299838829. The next prime is 18723299838959. The reversal of 18723299838931 is 13983899232781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18723299838931 - 2¹⁷ = 18723299707859 is a prime.

It is a super-3 number, since 3×18723299838931³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (18723299838431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9361649919465 + 9361649919466.

It is an arithmetic number, because the mean of its divisors is an integer number (9361649919466).

Almost surely, 2^{18723299838931} is an apocalyptic number.

18723299838931 is a deficient number, since it is larger than the sum of its proper divisors (1).

18723299838931 is an equidigital number, since it uses as much as digits as its factorization.

18723299838931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282175488, while the sum is 73.

The spelling of 18723299838931 in words is "eighteen trillion, seven hundred twenty-three billion, two hundred ninety-nine million, eight hundred thirty-eight thousand, nine hundred thirty-one".