18404684047 has 2 divisors, whose sum is σ = 18404684048. Its totient is φ = 18404684046.

The previous prime is 18404684027. The next prime is 18404684057. The reversal of 18404684047 is 74048640481.

It is a strong prime.

It is an emirp because it is prime and its reverse (74048640481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18404684047 - 2⁷ = 18404683919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18404683988 and 18404684006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18404684027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9202342023 + 9202342024.

It is an arithmetic number, because the mean of its divisors is an integer number (9202342024).

Almost surely, 2^18404684047 is an apocalyptic number.

18404684047 is a deficient number, since it is larger than the sum of its proper divisors (1).

18404684047 is an equidigital number, since it uses as much as digits as its factorization.

18404684047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 688128, while the sum is 46.

The spelling of 18404684047 in words is "eighteen billion, four hundred four million, six hundred eighty-four thousand, forty-seven".