18906418829 has 2 divisors, whose sum is σ = 18906418830. Its totient is φ = 18906418828.

The previous prime is 18906418801. The next prime is 18906418871. The reversal of 18906418829 is 92881460981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10469996329 + 8436422500 = 102323^2 + 91850^2 .

It is an emirp because it is prime and its reverse (92881460981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18906418829 - 2¹² = 18906414733 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18906418889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9453209414 + 9453209415.

It is an arithmetic number, because the mean of its divisors is an integer number (9453209415).

Almost surely, 2^18906418829 is an apocalyptic number.

It is an amenable number.

18906418829 is a deficient number, since it is larger than the sum of its proper divisors (1).

18906418829 is an equidigital number, since it uses as much as digits as its factorization.

18906418829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 56.

The spelling of 18906418829 in words is "eighteen billion, nine hundred six million, four hundred eighteen thousand, eight hundred twenty-nine".