666824502643 has 16 divisors (see below), whose sum is σ = 742953546720. Its totient is φ = 594247417344.

The previous prime is 666824502593. The next prime is 666824502653. The reversal of 666824502643 is 346205428666.

It is a cyclic number.

It is not a de Polignac number, because 666824502643 - 2¹³ = 666824494451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666824502653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4067755 + ... + 4228507.

It is an arithmetic number, because the mean of its divisors is an integer number (46434596670).

Almost surely, 2^666824502643 is an apocalyptic number.

666824502643 is a deficient number, since it is larger than the sum of its proper divisors (76129044077).

666824502643 is a wasteful number, since it uses less digits than its factorization.

666824502643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171798.

The product of its (nonzero) digits is 9953280, while the sum is 52.

The spelling of 666824502643 in words is "six hundred sixty-six billion, eight hundred twenty-four million, five hundred two thousand, six hundred forty-three".