18555565557011 has 16 divisors (see below), whose sum is σ = 21301862400000. Its totient is φ = 15833146876128.

The previous prime is 18555565556971. The next prime is 18555565557043. The reversal of 18555565557011 is 11075556555581.

It is a cyclic number.

It is not a de Polignac number, because 18555565557011 - 2³⁴ = 18538385687827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18555565557911) 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 in 15 ways as a sum of consecutive naturals, for example, 128786990 + ... + 128930988.

It is an arithmetic number, because the mean of its divisors is an integer number (1331366400000).

Almost surely, 2^{18555565557011} is an apocalyptic number.

18555565557011 is a deficient number, since it is larger than the sum of its proper divisors (2746296842989).

18555565557011 is a wasteful number, since it uses less digits than its factorization.

18555565557011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226778.

The product of its (nonzero) digits is 26250000, while the sum is 59.

The spelling of 18555565557011 in words is "eighteen trillion, five hundred fifty-five billion, five hundred sixty-five million, five hundred fifty-seven thousand, eleven".