18718635139 has 2 divisors, whose sum is σ = 18718635140. Its totient is φ = 18718635138.

The previous prime is 18718635079. The next prime is 18718635161. The reversal of 18718635139 is 93153681781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18718635139 - 2¹³ = 18718626947 is a prime.

It is not a weakly prime, because it can be changed into another prime (18718635739) by changing a digit.

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 as a sum of consecutive naturals, namely, 9359317569 + 9359317570.

It is an arithmetic number, because the mean of its divisors is an integer number (9359317570).

Almost surely, 2^18718635139 is an apocalyptic number.

18718635139 is a deficient number, since it is larger than the sum of its proper divisors (1).

18718635139 is an equidigital number, since it uses as much as digits as its factorization.

18718635139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 52.

The spelling of 18718635139 in words is "eighteen billion, seven hundred eighteen million, six hundred thirty-five thousand, one hundred thirty-nine".