64843352778073 has 2 divisors, whose sum is σ = 64843352778074. Its totient is φ = 64843352778072.

The previous prime is 64843352778059. The next prime is 64843352778119. The reversal of 64843352778073 is 37087725334846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35721755725824 + 29121597052249 = 5976768^2 + 5396443^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64843352778073 is a prime.

It is not a weakly prime, because it can be changed into another prime (64843352778773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32421676389036 + 32421676389037.

It is an arithmetic number, because the mean of its divisors is an integer number (32421676389037).

Almost surely, 2^{64843352778073} is an apocalyptic number.

It is an amenable number.

64843352778073 is a deficient number, since it is larger than the sum of its proper divisors (1).

64843352778073 is an equidigital number, since it uses as much as digits as its factorization.

64843352778073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 568995840, while the sum is 67.

The spelling of 64843352778073 in words is "sixty-four trillion, eight hundred forty-three billion, three hundred fifty-two million, seven hundred seventy-eight thousand, seventy-three".