646515468516433 has 2 divisors, whose sum is σ = 646515468516434. Its totient is φ = 646515468516432.

The previous prime is 646515468516383. The next prime is 646515468516481. The reversal of 646515468516433 is 334615864515646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 536049230591169 + 110466237925264 = 23152737^2 + 10510292^2 .

It is a cyclic number.

It is not a de Polignac number, because 646515468516433 - 2³³ = 646506878581841 is a prime.

It is not a weakly prime, because it can be changed into another prime (646515468516493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323257734258216 + 323257734258217.

It is an arithmetic number, because the mean of its divisors is an integer number (323257734258217).

Almost surely, 2^{646515468516433} is an apocalyptic number.

It is an amenable number.

646515468516433 is a deficient number, since it is larger than the sum of its proper divisors (1).

646515468516433 is an equidigital number, since it uses as much as digits as its factorization.

646515468516433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496000, while the sum is 67.

The spelling of 646515468516433 in words is "six hundred forty-six trillion, five hundred fifteen billion, four hundred sixty-eight million, five hundred sixteen thousand, four hundred thirty-three".