667006687 has 2 divisors, whose sum is σ = 667006688. Its totient is φ = 667006686.

The previous prime is 667006631. The next prime is 667006709. The reversal of 667006687 is 786600766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667006687 - 2¹⁵ = 666973919 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667006787) 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, 333503343 + 333503344.

It is an arithmetic number, because the mean of its divisors is an integer number (333503344).

Almost surely, 2^667006687 is an apocalyptic number.

667006687 is a deficient number, since it is larger than the sum of its proper divisors (1).

667006687 is an equidigital number, since it uses as much as digits as its factorization.

667006687 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 667006687 is about 25826.4726008025. The cubic root of 667006687 is about 873.7289570544.

The spelling of 667006687 in words is "six hundred sixty-seven million, six thousand, six hundred eighty-seven".