18504915139 has 2 divisors, whose sum is σ = 18504915140. Its totient is φ = 18504915138.

The previous prime is 18504915131. The next prime is 18504915161. The reversal of 18504915139 is 93151940581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18504915139 - 2³ = 18504915131 is a prime.

It is not a weakly prime, because it can be changed into another prime (18504915131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9252457569 + 9252457570.

It is an arithmetic number, because the mean of its divisors is an integer number (9252457570).

Almost surely, 2^18504915139 is an apocalyptic number.

18504915139 is a deficient number, since it is larger than the sum of its proper divisors (1).

18504915139 is an equidigital number, since it uses as much as digits as its factorization.

18504915139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 46.

The spelling of 18504915139 in words is "eighteen billion, five hundred four million, nine hundred fifteen thousand, one hundred thirty-nine".