666984735583 has 2 divisors, whose sum is σ = 666984735584. Its totient is φ = 666984735582.

The previous prime is 666984735581. The next prime is 666984735607. The reversal of 666984735583 is 385537489666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666984735583 - 2¹ = 666984735581 is a prime.

Together with 666984735581, 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 (666984735581) 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, 333492367791 + 333492367792.

It is an arithmetic number, because the mean of its divisors is an integer number (333492367792).

Almost surely, 2^666984735583 is an apocalyptic number.

666984735583 is a deficient number, since it is larger than the sum of its proper divisors (1).

666984735583 is an equidigital number, since it uses as much as digits as its factorization.

666984735583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 783820800, while the sum is 70.

The spelling of 666984735583 in words is "six hundred sixty-six billion, nine hundred eighty-four million, seven hundred thirty-five thousand, five hundred eighty-three".