64481752217 has 2 divisors, whose sum is σ = 64481752218. Its totient is φ = 64481752216.

The previous prime is 64481752177. The next prime is 64481752229. The reversal of 64481752217 is 71225718446.

64481752217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55197273481 + 9284478736 = 234941^2 + 96356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64481752217 is a prime.

It is not a weakly prime, because it can be changed into another prime (64481752277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32240876108 + 32240876109.

It is an arithmetic number, because the mean of its divisors is an integer number (32240876109).

Almost surely, 2^64481752217 is an apocalyptic number.

It is an amenable number.

64481752217 is a deficient number, since it is larger than the sum of its proper divisors (1).

64481752217 is an equidigital number, since it uses as much as digits as its factorization.

64481752217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 47.

The spelling of 64481752217 in words is "sixty-four billion, four hundred eighty-one million, seven hundred fifty-two thousand, two hundred seventeen".