18621706138 has 32 divisors (see below), whose sum is σ = 33574487040. Its totient is φ = 7577556480.

The previous prime is 18621706127. The next prime is 18621706141. The reversal of 18621706138 is 83160712681.

It is a junction number, because it is equal to n+sod(n) for n = 18621706094 and 18621706103.

It is an unprimeable number.

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, 381783 + ... + 427786.

It is an arithmetic number, because the mean of its divisors is an integer number (1049202720).

Almost surely, 2^18621706138 is an apocalyptic number.

18621706138 is a deficient number, since it is larger than the sum of its proper divisors (14952780902).

18621706138 is a wasteful number, since it uses less digits than its factorization.

18621706138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809662.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 18621706138 in words is "eighteen billion, six hundred twenty-one million, seven hundred six thousand, one hundred thirty-eight".