64956912217 has 2 divisors, whose sum is σ = 64956912218. Its totient is φ = 64956912216.

The previous prime is 64956912211. The next prime is 64956912239. The reversal of 64956912217 is 71221965946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64951580736 + 5331481 = 254856^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 64956912217 - 2²³ = 64948523609 is a prime.

It is not a weakly prime, because it can be changed into another prime (64956912211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32478456108 + 32478456109.

It is an arithmetic number, because the mean of its divisors is an integer number (32478456109).

Almost surely, 2^64956912217 is an apocalyptic number.

It is an amenable number.

64956912217 is a deficient number, since it is larger than the sum of its proper divisors (1).

64956912217 is an equidigital number, since it uses as much as digits as its factorization.

64956912217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 52.

The spelling of 64956912217 in words is "sixty-four billion, nine hundred fifty-six million, nine hundred twelve thousand, two hundred seventeen".