646373417 has 2 divisors, whose sum is σ = 646373418. Its totient is φ = 646373416.

The previous prime is 646373401. The next prime is 646373471. The reversal of 646373417 is 714373646.

Together with next prime (646373471) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 593214736 + 53158681 = 24356^2 + 7291^2 .

It is a cyclic number.

It is not a de Polignac number, because 646373417 - 2⁴ = 646373401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646372417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323186708 + 323186709.

It is an arithmetic number, because the mean of its divisors is an integer number (323186709).

Almost surely, 2^646373417 is an apocalyptic number.

It is an amenable number.

646373417 is a deficient number, since it is larger than the sum of its proper divisors (1).

646373417 is an equidigital number, since it uses as much as digits as its factorization.

646373417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 41.

The square root of 646373417 is about 25423.8749406930. The cubic root of 646373417 is about 864.6250803734.

The spelling of 646373417 in words is "six hundred forty-six million, three hundred seventy-three thousand, four hundred seventeen".