18307804813 has 2 divisors, whose sum is σ = 18307804814. Its totient is φ = 18307804812.

The previous prime is 18307804811. The next prime is 18307804847. The reversal of 18307804813 is 31840870381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13126972329 + 5180832484 = 114573^2 + 71978^2 .

It is a cyclic number.

It is not a de Polignac number, because 18307804813 - 2¹ = 18307804811 is a prime.

Together with 18307804811, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18307804813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18307804811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9153902406 + 9153902407.

It is an arithmetic number, because the mean of its divisors is an integer number (9153902407).

Almost surely, 2^18307804813 is an apocalyptic number.

It is an amenable number.

18307804813 is a deficient number, since it is larger than the sum of its proper divisors (1).

18307804813 is an equidigital number, since it uses as much as digits as its factorization.

18307804813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 43.

The spelling of 18307804813 in words is "eighteen billion, three hundred seven million, eight hundred four thousand, eight hundred thirteen".