18665490839 has 2 divisors, whose sum is σ = 18665490840. Its totient is φ = 18665490838.

The previous prime is 18665490797. The next prime is 18665490859. The reversal of 18665490839 is 93809456681.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18665490839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18665490859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9332745419 + 9332745420.

It is an arithmetic number, because the mean of its divisors is an integer number (9332745420).

Almost surely, 2^18665490839 is an apocalyptic number.

18665490839 is a deficient number, since it is larger than the sum of its proper divisors (1).

18665490839 is an equidigital number, since it uses as much as digits as its factorization.

18665490839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11197440, while the sum is 59.

The spelling of 18665490839 in words is "eighteen billion, six hundred sixty-five million, four hundred ninety thousand, eight hundred thirty-nine".