64360728209 has 2 divisors, whose sum is σ = 64360728210. Its totient is φ = 64360728208.

The previous prime is 64360728197. The next prime is 64360728317. The reversal of 64360728209 is 90282706346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37027380625 + 27333347584 = 192425^2 + 165328^2 .

It is a cyclic number.

It is not a de Polignac number, because 64360728209 - 2⁸ = 64360727953 is a prime.

It is not a weakly prime, because it can be changed into another prime (64360728109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32180364104 + 32180364105.

It is an arithmetic number, because the mean of its divisors is an integer number (32180364105).

Almost surely, 2^64360728209 is an apocalyptic number.

It is an amenable number.

64360728209 is a deficient number, since it is larger than the sum of its proper divisors (1).

64360728209 is an equidigital number, since it uses as much as digits as its factorization.

64360728209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 64360728209 in words is "sixty-four billion, three hundred sixty million, seven hundred twenty-eight thousand, two hundred nine".