666006700669 has 2 divisors, whose sum is σ = 666006700670. Its totient is φ = 666006700668.

The previous prime is 666006700643. The next prime is 666006700727. The reversal of 666006700669 is 966007600666.

666006700669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366811922500 + 299194778169 = 605650^2 + 546987^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666006700669 is a prime.

It is a super-2 number, since 2×666006700669² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666006700169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333003350334 + 333003350335.

It is an arithmetic number, because the mean of its divisors is an integer number (333003350335).

Almost surely, 2^666006700669 is an apocalyptic number.

It is an amenable number.

666006700669 is a deficient number, since it is larger than the sum of its proper divisors (1).

666006700669 is an equidigital number, since it uses as much as digits as its factorization.

666006700669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 52.

The spelling of 666006700669 in words is "six hundred sixty-six billion, six million, seven hundred thousand, six hundred sixty-nine".