18555565557043 has 2 divisors, whose sum is σ = 18555565557044. Its totient is φ = 18555565557042.

The previous prime is 18555565556971. The next prime is 18555565557059. The reversal of 18555565557043 is 34075556555581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18555565557043 - 2²⁵ = 18555532002611 is a prime.

It is not a weakly prime, because it can be changed into another prime (18555565537043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9277782778521 + 9277782778522.

It is an arithmetic number, because the mean of its divisors is an integer number (9277782778522).

Almost surely, 2^{18555565557043} is an apocalyptic number.

18555565557043 is a deficient number, since it is larger than the sum of its proper divisors (1).

18555565557043 is an equidigital number, since it uses as much as digits as its factorization.

18555565557043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 315000000, while the sum is 64.

The spelling of 18555565557043 in words is "eighteen trillion, five hundred fifty-five billion, five hundred sixty-five million, five hundred fifty-seven thousand, forty-three".