18335579987 has 2 divisors, whose sum is σ = 18335579988. Its totient is φ = 18335579986.

The previous prime is 18335579957. The next prime is 18335580047. The reversal of 18335579987 is 78997553381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18335579987 - 2¹² = 18335575891 is a prime.

It is not a weakly prime, because it can be changed into another prime (18335579957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9167789993 + 9167789994.

It is an arithmetic number, because the mean of its divisors is an integer number (9167789994).

Almost surely, 2^18335579987 is an apocalyptic number.

18335579987 is a deficient number, since it is larger than the sum of its proper divisors (1).

18335579987 is an equidigital number, since it uses as much as digits as its factorization.

18335579987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57153600, while the sum is 65.

The spelling of 18335579987 in words is "eighteen billion, three hundred thirty-five million, five hundred seventy-nine thousand, nine hundred eighty-seven".