18394447783 has 2 divisors, whose sum is σ = 18394447784. Its totient is φ = 18394447782.

The previous prime is 18394447739. The next prime is 18394447793. The reversal of 18394447783 is 38774449381.

It is a strong prime.

It is an emirp because it is prime and its reverse (38774449381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18394447783 - 2²⁹ = 17857576871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18394447793) 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, 9197223891 + 9197223892.

It is an arithmetic number, because the mean of its divisors is an integer number (9197223892).

Almost surely, 2^18394447783 is an apocalyptic number.

18394447783 is a deficient number, since it is larger than the sum of its proper divisors (1).

18394447783 is an equidigital number, since it uses as much as digits as its factorization.

18394447783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16257024, while the sum is 58.

The spelling of 18394447783 in words is "eighteen billion, three hundred ninety-four million, four hundred forty-seven thousand, seven hundred eighty-three".