18350353687 has 4 divisors (see below), whose sum is σ = 18482370760. Its totient is φ = 18218336616.

The previous prime is 18350353657. The next prime is 18350353699. The reversal of 18350353687 is 78635305381.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18350353687 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18350353687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18350353627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66008328 + ... + 66008605.

It is an arithmetic number, because the mean of its divisors is an integer number (4620592690).

Almost surely, 2^18350353687 is an apocalyptic number.

18350353687 is a deficient number, since it is larger than the sum of its proper divisors (132017073).

18350353687 is a wasteful number, since it uses less digits than its factorization.

18350353687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132017072.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 18350353687 in words is "eighteen billion, three hundred fifty million, three hundred fifty-three thousand, six hundred eighty-seven".