18285999613831 has 2 divisors, whose sum is σ = 18285999613832. Its totient is φ = 18285999613830.

The previous prime is 18285999613813. The next prime is 18285999613859. The reversal of 18285999613831 is 13831699958281.

Together with previous prime (18285999613813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18285999613831 - 2⁹ = 18285999613319 is a prime.

It is a super-2 number, since 2×18285999613831² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18285999613801) 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, 9142999806915 + 9142999806916.

It is an arithmetic number, because the mean of its divisors is an integer number (9142999806916).

Almost surely, 2^{18285999613831} is an apocalyptic number.

18285999613831 is a deficient number, since it is larger than the sum of its proper divisors (1).

18285999613831 is an equidigital number, since it uses as much as digits as its factorization.

18285999613831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201553920, while the sum is 73.

The spelling of 18285999613831 in words is "eighteen trillion, two hundred eighty-five billion, nine hundred ninety-nine million, six hundred thirteen thousand, eight hundred thirty-one".