666703674021 has 24 divisors (see below), whose sum is σ = 1128077462304. Its totient is φ = 346339570080.

The previous prime is 666703674011. The next prime is 666703674037. The reversal of 666703674021 is 120476307666.

It is not a de Polignac number, because 666703674021 - 2⁹ = 666703673509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666703674001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 206152890 + ... + 206156123.

It is an arithmetic number, because the mean of its divisors is an integer number (47003227596).

Almost surely, 2^666703674021 is an apocalyptic number.

It is an amenable number.

666703674021 is a deficient number, since it is larger than the sum of its proper divisors (461373788283).

666703674021 is a wasteful number, since it uses less digits than its factorization.

666703674021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412309041 (or 412309034 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 48.

The spelling of 666703674021 in words is "six hundred sixty-six billion, seven hundred three million, six hundred seventy-four thousand, twenty-one".