666666703679 has 2 divisors, whose sum is σ = 666666703680. Its totient is φ = 666666703678.

The previous prime is 666666703669. The next prime is 666666703699. The reversal of 666666703679 is 976307666666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666666703679 - 2⁴ = 666666703663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666666703639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333333351839 + 333333351840.

It is an arithmetic number, because the mean of its divisors is an integer number (333333351840).

Almost surely, 2^666666703679 is an apocalyptic number.

666666703679 is a deficient number, since it is larger than the sum of its proper divisors (1).

666666703679 is an equidigital number, since it uses as much as digits as its factorization.

666666703679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 370355328, while the sum is 68.

The spelling of 666666703679 in words is "six hundred sixty-six billion, six hundred sixty-six million, seven hundred three thousand, six hundred seventy-nine".