18055388563 has 2 divisors, whose sum is σ = 18055388564. Its totient is φ = 18055388562.

The previous prime is 18055388557. The next prime is 18055388567. The reversal of 18055388563 is 36588355081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18055388563 - 2²¹ = 18053291411 is a prime.

It is a super-2 number, since 2×18055388563² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18055388563.

It is not a weakly prime, because it can be changed into another prime (18055388567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9027694281 + 9027694282.

It is an arithmetic number, because the mean of its divisors is an integer number (9027694282).

Almost surely, 2^18055388563 is an apocalyptic number.

18055388563 is a deficient number, since it is larger than the sum of its proper divisors (1).

18055388563 is an equidigital number, since it uses as much as digits as its factorization.

18055388563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456000, while the sum is 52.

The spelling of 18055388563 in words is "eighteen billion, fifty-five million, three hundred eighty-eight thousand, five hundred sixty-three".