18043656139 has 2 divisors, whose sum is σ = 18043656140. Its totient is φ = 18043656138.

The previous prime is 18043656121. The next prime is 18043656199. The reversal of 18043656139 is 93165634081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18043656139 - 2¹¹ = 18043654091 is a prime.

It is not a weakly prime, because it can be changed into another prime (18043656199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9021828069 + 9021828070.

It is an arithmetic number, because the mean of its divisors is an integer number (9021828070).

Almost surely, 2^18043656139 is an apocalyptic number.

18043656139 is a deficient number, since it is larger than the sum of its proper divisors (1).

18043656139 is an equidigital number, since it uses as much as digits as its factorization.

18043656139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 18043656139 in words is "eighteen billion, forty-three million, six hundred fifty-six thousand, one hundred thirty-nine".