18351851683685 has 24 divisors (see below), whose sum is σ = 23939336513160. Its totient is φ = 13499404419072.

The previous prime is 18351851683673. The next prime is 18351851683703. The reversal of 18351851683685 is 58638615815381.

It can be written as a sum of positive squares in 12 ways, for example, as 4710840179809 + 13641011503876 = 2170447^2 + 3693374^2 .

It is not a de Polignac number, because 18351851683685 - 2¹² = 18351851679589 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42036080 + ... + 42470409.

It is an arithmetic number, because the mean of its divisors is an integer number (997472354715).

Almost surely, 2^{18351851683685} is an apocalyptic number.

It is an amenable number.

18351851683685 is a deficient number, since it is larger than the sum of its proper divisors (5587484829475).

18351851683685 is a wasteful number, since it uses less digits than its factorization.

18351851683685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84506777 (or 84506764 counting only the distinct ones).

The product of its digits is 165888000, while the sum is 68.

The spelling of 18351851683685 in words is "eighteen trillion, three hundred fifty-one billion, eight hundred fifty-one million, six hundred eighty-three thousand, six hundred eighty-five".