18855693529 has 2 divisors, whose sum is σ = 18855693530. Its totient is φ = 18855693528.

The previous prime is 18855693523. The next prime is 18855693547. The reversal of 18855693529 is 92539655881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18706853529 + 148840000 = 136773^2 + 12200^2 .

It is an emirp because it is prime and its reverse (92539655881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18855693529 - 2²³ = 18847304921 is a prime.

It is not a weakly prime, because it can be changed into another prime (18855693523) 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, 9427846764 + 9427846765.

It is an arithmetic number, because the mean of its divisors is an integer number (9427846765).

Almost surely, 2^18855693529 is an apocalyptic number.

It is an amenable number.

18855693529 is a deficient number, since it is larger than the sum of its proper divisors (1).

18855693529 is an equidigital number, since it uses as much as digits as its factorization.

18855693529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328000, while the sum is 61.

The spelling of 18855693529 in words is "eighteen billion, eight hundred fifty-five million, six hundred ninety-three thousand, five hundred twenty-nine".