849663866503 has 2 divisors, whose sum is σ = 849663866504. Its totient is φ = 849663866502.

The previous prime is 849663866501. The next prime is 849663866507. The reversal of 849663866503 is 305668366948.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 849663866503 - 2¹ = 849663866501 is a prime.

Together with 849663866501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849663866501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424831933251 + 424831933252.

It is an arithmetic number, because the mean of its divisors is an integer number (424831933252).

Almost surely, 2^849663866503 is an apocalyptic number.

849663866503 is a deficient number, since it is larger than the sum of its proper divisors (1).

849663866503 is an equidigital number, since it uses as much as digits as its factorization.

849663866503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134369280, while the sum is 64.

The spelling of 849663866503 in words is "eight hundred forty-nine billion, six hundred sixty-three million, eight hundred sixty-six thousand, five hundred three".