18340687943 has 2 divisors, whose sum is σ = 18340687944. Its totient is φ = 18340687942.

The previous prime is 18340687913. The next prime is 18340687997. The reversal of 18340687943 is 34978604381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18340687943 - 2¹² = 18340683847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18340687913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9170343971 + 9170343972.

It is an arithmetic number, because the mean of its divisors is an integer number (9170343972).

Almost surely, 2^18340687943 is an apocalyptic number.

18340687943 is a deficient number, since it is larger than the sum of its proper divisors (1).

18340687943 is an equidigital number, since it uses as much as digits as its factorization.

18340687943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 18340687943 in words is "eighteen billion, three hundred forty million, six hundred eighty-seven thousand, nine hundred forty-three".