18138623063 has 16 divisors (see below), whose sum is σ = 20811313152. Its totient is φ = 15656628000.

The previous prime is 18138623029. The next prime is 18138623077. The reversal of 18138623063 is 36032683181.

It is a cyclic number.

It is not a de Polignac number, because 18138623063 - 2¹⁶ = 18138557527 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18138623063.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138623023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 483743 + ... + 519888.

It is an arithmetic number, because the mean of its divisors is an integer number (1300707072).

Almost surely, 2^18138623063 is an apocalyptic number.

18138623063 is a deficient number, since it is larger than the sum of its proper divisors (2672690089).

18138623063 is a wasteful number, since it uses less digits than its factorization.

18138623063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1003726.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 18138623063 in words is "eighteen billion, one hundred thirty-eight million, six hundred twenty-three thousand, sixty-three".