18736454687 has 2 divisors, whose sum is σ = 18736454688. Its totient is φ = 18736454686.

The previous prime is 18736454683. The next prime is 18736454717. The reversal of 18736454687 is 78645463781.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (78645463781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18736454687 - 2² = 18736454683 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18736454683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9368227343 + 9368227344.

It is an arithmetic number, because the mean of its divisors is an integer number (9368227344).

Almost surely, 2^18736454687 is an apocalyptic number.

18736454687 is a deficient number, since it is larger than the sum of its proper divisors (1).

18736454687 is an equidigital number, since it uses as much as digits as its factorization.

18736454687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27095040, while the sum is 59.

The spelling of 18736454687 in words is "eighteen billion, seven hundred thirty-six million, four hundred fifty-four thousand, six hundred eighty-seven".