18685018334839 has 2 divisors, whose sum is σ = 18685018334840. Its totient is φ = 18685018334838.

The previous prime is 18685018334831. The next prime is 18685018335007. The reversal of 18685018334839 is 93843381058681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18685018334839 - 2³ = 18685018334831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18685018334831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342509167419 + 9342509167420.

It is an arithmetic number, because the mean of its divisors is an integer number (9342509167420).

Almost surely, 2^{18685018334839} is an apocalyptic number.

18685018334839 is a deficient number, since it is larger than the sum of its proper divisors (1).

18685018334839 is an equidigital number, since it uses as much as digits as its factorization.

18685018334839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119439360, while the sum is 67.

The spelling of 18685018334839 in words is "eighteen trillion, six hundred eighty-five billion, eighteen million, three hundred thirty-four thousand, eight hundred thirty-nine".