18042804557 has 2 divisors, whose sum is σ = 18042804558. Its totient is φ = 18042804556.

The previous prime is 18042804547. The next prime is 18042804583. The reversal of 18042804557 is 75540824081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13507320841 + 4535483716 = 116221^2 + 67346^2 .

It is a cyclic number.

It is not a de Polignac number, because 18042804557 - 2²² = 18038610253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18042804547) 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, 9021402278 + 9021402279.

It is an arithmetic number, because the mean of its divisors is an integer number (9021402279).

Almost surely, 2^18042804557 is an apocalyptic number.

It is an amenable number.

18042804557 is a deficient number, since it is larger than the sum of its proper divisors (1).

18042804557 is an equidigital number, since it uses as much as digits as its factorization.

18042804557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 358400, while the sum is 44.

The spelling of 18042804557 in words is "eighteen billion, forty-two million, eight hundred four thousand, five hundred fifty-seven".