663665642123 has 12 divisors (see below), whose sum is σ = 769092241992. Its totient is φ = 567842257920.

The previous prime is 663665642113. The next prime is 663665642207. The reversal of 663665642123 is 321246566366.

It is not a de Polignac number, because 663665642123 - 2¹⁰ = 663665641099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663665642113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 104379590 + ... + 104385947.

It is an arithmetic number, because the mean of its divisors is an integer number (64091020166).

Almost surely, 2^663665642123 is an apocalyptic number.

663665642123 is a deficient number, since it is larger than the sum of its proper divisors (105426599869).

663665642123 is a wasteful number, since it uses less digits than its factorization.

663665642123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208765582 (or 208765565 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 50.

The spelling of 663665642123 in words is "six hundred sixty-three billion, six hundred sixty-five million, six hundred forty-two thousand, one hundred twenty-three".