667406666627 has 2 divisors, whose sum is σ = 667406666628. Its totient is φ = 667406666626.

The previous prime is 667406666617. The next prime is 667406666683. The reversal of 667406666627 is 726666604766.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667406666627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667406666627.

It is not a weakly prime, because it can be changed into another prime (667406666617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333703333313 + 333703333314.

It is an arithmetic number, because the mean of its divisors is an integer number (333703333314).

Almost surely, 2^667406666627 is an apocalyptic number.

667406666627 is a deficient number, since it is larger than the sum of its proper divisors (1).

667406666627 is an equidigital number, since it uses as much as digits as its factorization.

667406666627 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109734912, while the sum is 62.

The spelling of 667406666627 in words is "six hundred sixty-seven billion, four hundred six million, six hundred sixty-six thousand, six hundred twenty-seven".