64436664247 has 2 divisors, whose sum is σ = 64436664248. Its totient is φ = 64436664246.

The previous prime is 64436664233. The next prime is 64436664283. The reversal of 64436664247 is 74246663446.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64436664247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64436664194 and 64436664203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64436664287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32218332123 + 32218332124.

It is an arithmetic number, because the mean of its divisors is an integer number (32218332124).

Almost surely, 2^64436664247 is an apocalyptic number.

64436664247 is a deficient number, since it is larger than the sum of its proper divisors (1).

64436664247 is an equidigital number, since it uses as much as digits as its factorization.

64436664247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 52.

The spelling of 64436664247 in words is "sixty-four billion, four hundred thirty-six million, six hundred sixty-four thousand, two hundred forty-seven".