667406666617 has 2 divisors, whose sum is σ = 667406666618. Its totient is φ = 667406666616.

The previous prime is 667406666609. The next prime is 667406666627. The reversal of 667406666617 is 716666604766.

It is a happy number.

667406666617 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., 653657697081 + 13748969536 = 808491^2 + 117256^2 .

It is a cyclic number.

It is not a de Polignac number, because 667406666617 - 2³ = 667406666609 is a prime.

It is not a weakly prime, because it can be changed into another prime (667406666627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333703333308 + 333703333309.

It is an arithmetic number, because the mean of its divisors is an integer number (333703333309).

Almost surely, 2^667406666617 is an apocalyptic number.

It is an amenable number.

667406666617 is a deficient number, since it is larger than the sum of its proper divisors (1).

667406666617 is an equidigital number, since it uses as much as digits as its factorization.

667406666617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54867456, while the sum is 61.

The spelling of 667406666617 in words is "six hundred sixty-seven billion, four hundred six million, six hundred sixty-six thousand, six hundred seventeen".