666700007 has 2 divisors, whose sum is σ = 666700008. Its totient is φ = 666700006.

The previous prime is 666699997. The next prime is 666700009. The reversal of 666700007 is 700007666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666700007 - 2¹⁴ = 666683623 is a prime.

Together with 666700009, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666700009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333350003 + 333350004.

It is an arithmetic number, because the mean of its divisors is an integer number (333350004).

Almost surely, 2^666700007 is an apocalyptic number.

666700007 is a deficient number, since it is larger than the sum of its proper divisors (1).

666700007 is an equidigital number, since it uses as much as digits as its factorization.

666700007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 666700007 is about 25820.5345994230. The cubic root of 666700007 is about 873.5950272255.

The spelling of 666700007 in words is "six hundred sixty-six million, seven hundred thousand, seven".