18385472771 has 2 divisors, whose sum is σ = 18385472772. Its totient is φ = 18385472770.

The previous prime is 18385472761. The next prime is 18385472779. The reversal of 18385472771 is 17727458381.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17727458381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18385472771 - 2²² = 18381278467 is a prime.

It is not a weakly prime, because it can be changed into another prime (18385472779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9192736385 + 9192736386.

It is an arithmetic number, because the mean of its divisors is an integer number (9192736386).

Almost surely, 2^18385472771 is an apocalyptic number.

18385472771 is a deficient number, since it is larger than the sum of its proper divisors (1).

18385472771 is an equidigital number, since it uses as much as digits as its factorization.

18385472771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2634240, while the sum is 53.

The spelling of 18385472771 in words is "eighteen billion, three hundred eighty-five million, four hundred seventy-two thousand, seven hundred seventy-one".