18353418685 has 12 divisors (see below), whose sum is σ = 25619874588. Its totient is φ = 12585201216.

The previous prime is 18353418679. The next prime is 18353418701. The reversal of 18353418685 is 58681435381.

It can be written as a sum of positive squares in 2 ways, for example, as 9895673529 + 8457745156 = 99477^2 + 91966^2 .

It is not a de Polignac number, because 18353418685 - 2²⁹ = 17816547773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37455712 + ... + 37456201.

It is an arithmetic number, because the mean of its divisors is an integer number (2134989549).

Almost surely, 2^18353418685 is an apocalyptic number.

It is an amenable number.

18353418685 is a deficient number, since it is larger than the sum of its proper divisors (7266455903).

18353418685 is an equidigital number, since it uses as much as digits as its factorization.

18353418685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74911932 (or 74911925 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 52.

The spelling of 18353418685 in words is "eighteen billion, three hundred fifty-three million, four hundred eighteen thousand, six hundred eighty-five".