18429638993 has 2 divisors, whose sum is σ = 18429638994. Its totient is φ = 18429638992.

The previous prime is 18429638959. The next prime is 18429639001. The reversal of 18429638993 is 39983692481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13342098064 + 5087540929 = 115508^2 + 71327^2 .

It is a cyclic number.

It is not a de Polignac number, because 18429638993 - 2¹⁰ = 18429637969 is a prime.

It is not a weakly prime, because it can be changed into another prime (18429638923) 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, 9214819496 + 9214819497.

It is an arithmetic number, because the mean of its divisors is an integer number (9214819497).

Almost surely, 2^18429638993 is an apocalyptic number.

It is an amenable number.

18429638993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18429638993 is an equidigital number, since it uses as much as digits as its factorization.

18429638993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20155392, while the sum is 62.

The spelling of 18429638993 in words is "eighteen billion, four hundred twenty-nine million, six hundred thirty-eight thousand, nine hundred ninety-three".