666243123155703 has 40 divisors (see below), whose sum is σ = 997048909710128. Its totient is φ = 443360790902016.

The previous prime is 666243123155683. The next prime is 666243123155711. The reversal of 666243123155703 is 307551321342666.

It is not a de Polignac number, because 666243123155703 - 2¹⁷ = 666243123024631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666243123155703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666243123153703) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 116608125 + ... + 122188137.

Almost surely, 2^{666243123155703} is an apocalyptic number.

666243123155703 is a deficient number, since it is larger than the sum of its proper divisors (330805786554425).

666243123155703 is a wasteful number, since it uses less digits than its factorization.

666243123155703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582685 (or 5582676 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 54.

The spelling of 666243123155703 in words is "six hundred sixty-six trillion, two hundred forty-three billion, one hundred twenty-three million, one hundred fifty-five thousand, seven hundred three".