18404684057 has 2 divisors, whose sum is σ = 18404684058. Its totient is φ = 18404684056.

The previous prime is 18404684047. The next prime is 18404684093. The reversal of 18404684057 is 75048640481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11676747481 + 6727936576 = 108059^2 + 82024^2 .

It is an emirp because it is prime and its reverse (75048640481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18404684057 - 2¹⁸ = 18404421913 is a prime.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9202342028 + 9202342029.

It is an arithmetic number, because the mean of its divisors is an integer number (9202342029).

Almost surely, 2^18404684057 is an apocalyptic number.

It is an amenable number.

18404684057 is a deficient number, since it is larger than the sum of its proper divisors (1).

18404684057 is an equidigital number, since it uses as much as digits as its factorization.

18404684057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 860160, while the sum is 47.

The spelling of 18404684057 in words is "eighteen billion, four hundred four million, six hundred eighty-four thousand, fifty-seven".