667749830417 has 2 divisors, whose sum is σ = 667749830418. Its totient is φ = 667749830416.

The previous prime is 667749830401. The next prime is 667749830437. The reversal of 667749830417 is 714038947766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 654377452096 + 13372378321 = 808936^2 + 115639^2 .

It is a cyclic number.

It is not a de Polignac number, because 667749830417 - 2⁴ = 667749830401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667749830417.

It is not a weakly prime, because it can be changed into another prime (667749830437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333874915208 + 333874915209.

It is an arithmetic number, because the mean of its divisors is an integer number (333874915209).

Almost surely, 2^667749830417 is an apocalyptic number.

It is an amenable number.

667749830417 is a deficient number, since it is larger than the sum of its proper divisors (1).

667749830417 is an equidigital number, since it uses as much as digits as its factorization.

667749830417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42674688, while the sum is 62.

The spelling of 667749830417 in words is "six hundred sixty-seven billion, seven hundred forty-nine million, eight hundred thirty thousand, four hundred seventeen".