18428488693 has 2 divisors, whose sum is σ = 18428488694. Its totient is φ = 18428488692.

The previous prime is 18428488681. The next prime is 18428488703. The reversal of 18428488693 is 39688482481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13665142404 + 4763346289 = 116898^2 + 69017^2 .

It is a cyclic number.

It is not a de Polignac number, because 18428488693 - 2⁹ = 18428488181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18428488093) 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, 9214244346 + 9214244347.

It is an arithmetic number, because the mean of its divisors is an integer number (9214244347).

Almost surely, 2^18428488693 is an apocalyptic number.

It is an amenable number.

18428488693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428488693 is an equidigital number, since it uses as much as digits as its factorization.

18428488693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21233664, while the sum is 61.

The spelling of 18428488693 in words is "eighteen billion, four hundred twenty-eight million, four hundred eighty-eight thousand, six hundred ninety-three".