647342967398417 has 2 divisors, whose sum is σ = 647342967398418. Its totient is φ = 647342967398416.

The previous prime is 647342967398333. The next prime is 647342967398419. The reversal of 647342967398417 is 714893769243746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434193946457041 + 213149020941376 = 20837321^2 + 14599624^2 .

It is a cyclic number.

It is not a de Polignac number, because 647342967398417 - 2¹⁶ = 647342967332881 is a prime.

Together with 647342967398419, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (647342967398419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323671483699208 + 323671483699209.

It is an arithmetic number, because the mean of its divisors is an integer number (323671483699209).

Almost surely, 2^{647342967398417} is an apocalyptic number.

It is an amenable number.

647342967398417 is a deficient number, since it is larger than the sum of its proper divisors (1).

647342967398417 is an equidigital number, since it uses as much as digits as its factorization.

647342967398417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9217732608, while the sum is 80.

The spelling of 647342967398417 in words is "six hundred forty-seven trillion, three hundred forty-two billion, nine hundred sixty-seven million, three hundred ninety-eight thousand, four hundred seventeen".