18309744470687 has 2 divisors, whose sum is σ = 18309744470688. Its totient is φ = 18309744470686.

The previous prime is 18309744470639. The next prime is 18309744470737. The reversal of 18309744470687 is 78607444790381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18309744470687 - 2¹² = 18309744466591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18309744460687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9154872235343 + 9154872235344.

It is an arithmetic number, because the mean of its divisors is an integer number (9154872235344).

Almost surely, 2^{18309744470687} is an apocalyptic number.

18309744470687 is a deficient number, since it is larger than the sum of its proper divisors (1).

18309744470687 is an equidigital number, since it uses as much as digits as its factorization.

18309744470687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 227598336, while the sum is 68.

The spelling of 18309744470687 in words is "eighteen trillion, three hundred nine billion, seven hundred forty-four million, four hundred seventy thousand, six hundred eighty-seven".