18564938063 has 12 divisors (see below), whose sum is σ = 21608326080. Its totient is φ = 15903683712.

The previous prime is 18564938059. The next prime is 18564938081. The reversal of 18564938063 is 36083946581.

It is not a de Polignac number, because 18564938063 - 2² = 18564938059 is a prime.

It is a super-3 number, since 3×18564938063³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18564937996 and 18564938014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18564938003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21506 + ... + 193887.

It is an arithmetic number, because the mean of its divisors is an integer number (1800693840).

Almost surely, 2^18564938063 is an apocalyptic number.

18564938063 is a deficient number, since it is larger than the sum of its proper divisors (3043388017).

18564938063 is a wasteful number, since it uses less digits than its factorization.

18564938063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217166 (or 217159 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 18564938063 in words is "eighteen billion, five hundred sixty-four million, nine hundred thirty-eight thousand, sixty-three".