666723452843 has 16 divisors (see below), whose sum is σ = 769223459520. Its totient is φ = 566061461376.

The previous prime is 666723452819. The next prime is 666723452861. The reversal of 666723452843 is 348254327666.

It is a cyclic number.

It is not a de Polignac number, because 666723452843 - 2¹⁰ = 666723451819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666723452243) 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, 697580 + ... + 1349097.

It is an arithmetic number, because the mean of its divisors is an integer number (48076466220).

Almost surely, 2^666723452843 is an apocalyptic number.

666723452843 is a deficient number, since it is larger than the sum of its proper divisors (102500006677).

666723452843 is a wasteful number, since it uses less digits than its factorization.

666723452843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2047126.

The product of its digits is 34836480, while the sum is 56.

The spelling of 666723452843 in words is "six hundred sixty-six billion, seven hundred twenty-three million, four hundred fifty-two thousand, eight hundred forty-three".