666786007 has 2 divisors, whose sum is σ = 666786008. Its totient is φ = 666786006.

The previous prime is 666785983. The next prime is 666786023. The reversal of 666786007 is 700687666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666786007 - 2⁷ = 666785879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666786047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333393003 + 333393004.

It is an arithmetic number, because the mean of its divisors is an integer number (333393004).

Almost surely, 2^666786007 is an apocalyptic number.

666786007 is a deficient number, since it is larger than the sum of its proper divisors (1).

666786007 is an equidigital number, since it uses as much as digits as its factorization.

666786007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 666786007 is about 25822.1998869190. The cubic root of 666786007 is about 873.6325883181.

The spelling of 666786007 in words is "six hundred sixty-six million, seven hundred eighty-six thousand, seven".