666666703673 has 4 divisors (see below), whose sum is σ = 666679368228. Its totient is φ = 666654039120.

The previous prime is 666666703669. The next prime is 666666703679. The reversal of 666666703673 is 376307666666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 567509102224 + 99157601449 = 753332^2 + 314893^2 .

It is a cyclic number.

It is not a de Polignac number, because 666666703673 - 2² = 666666703669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666666703679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6252986 + ... + 6358707.

It is an arithmetic number, because the mean of its divisors is an integer number (166669842057).

Almost surely, 2^666666703673 is an apocalyptic number.

It is an amenable number.

666666703673 is a deficient number, since it is larger than the sum of its proper divisors (12664555).

666666703673 is a wasteful number, since it uses less digits than its factorization.

666666703673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12664554.

The product of its (nonzero) digits is 123451776, while the sum is 62.

The spelling of 666666703673 in words is "six hundred sixty-six billion, six hundred sixty-six million, seven hundred three thousand, six hundred seventy-three".