64839107449 has 2 divisors, whose sum is σ = 64839107450. Its totient is φ = 64839107448.

The previous prime is 64839107413. The next prime is 64839107471. The reversal of 64839107449 is 94470193846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59636082025 + 5203025424 = 244205^2 + 72132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64839107449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64839107449.

It is not a weakly prime, because it can be changed into another prime (64839207449) 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, 32419553724 + 32419553725.

It is an arithmetic number, because the mean of its divisors is an integer number (32419553725).

Almost surely, 2^64839107449 is an apocalyptic number.

It is an amenable number.

64839107449 is a deficient number, since it is larger than the sum of its proper divisors (1).

64839107449 is an equidigital number, since it uses as much as digits as its factorization.

64839107449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 64839107449 in words is "sixty-four billion, eight hundred thirty-nine million, one hundred seven thousand, four hundred forty-nine".