18683351837 has 4 divisors (see below), whose sum is σ = 18802354236. Its totient is φ = 18564349440.

The previous prime is 18683351809. The next prime is 18683351867. The reversal of 18683351837 is 73815338681.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2383978276 + 16299373561 = 48826^2 + 127669^2 .

It is a cyclic number.

It is not a de Polignac number, because 18683351837 - 2⁸ = 18683351581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18683351807) 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, 59500964 + ... + 59501277.

It is an arithmetic number, because the mean of its divisors is an integer number (4700588559).

Almost surely, 2^18683351837 is an apocalyptic number.

It is an amenable number.

18683351837 is a deficient number, since it is larger than the sum of its proper divisors (119002399).

18683351837 is a wasteful number, since it uses less digits than its factorization.

18683351837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119002398.

The product of its digits is 2903040, while the sum is 53.

The spelling of 18683351837 in words is "eighteen billion, six hundred eighty-three million, three hundred fifty-one thousand, eight hundred thirty-seven".