667406740673 has 2 divisors, whose sum is σ = 667406740674. Its totient is φ = 667406740672.

The previous prime is 667406740633. The next prime is 667406740681. The reversal of 667406740673 is 376047604766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613734361744 + 53672378929 = 783412^2 + 231673^2 .

It is a cyclic number.

It is not a de Polignac number, because 667406740673 - 2⁸ = 667406740417 is a prime.

It is not a weakly prime, because it can be changed into another prime (667406740633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333703370336 + 333703370337.

It is an arithmetic number, because the mean of its divisors is an integer number (333703370337).

Almost surely, 2^667406740673 is an apocalyptic number.

It is an amenable number.

667406740673 is a deficient number, since it is larger than the sum of its proper divisors (1).

667406740673 is an equidigital number, since it uses as much as digits as its factorization.

667406740673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21337344, while the sum is 56.

The spelling of 667406740673 in words is "six hundred sixty-seven billion, four hundred six million, seven hundred forty thousand, six hundred seventy-three".