64718881709 has 2 divisors, whose sum is σ = 64718881710. Its totient is φ = 64718881708.

The previous prime is 64718881699. The next prime is 64718881769. The reversal of 64718881709 is 90718881746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64714272100 + 4609609 = 254390^2 + 2147^2 .

It is a cyclic number.

It is not a de Polignac number, because 64718881709 - 2⁴ = 64718881693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64718881769) 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, 32359440854 + 32359440855.

It is an arithmetic number, because the mean of its divisors is an integer number (32359440855).

Almost surely, 2^64718881709 is an apocalyptic number.

It is an amenable number.

64718881709 is a deficient number, since it is larger than the sum of its proper divisors (1).

64718881709 is an equidigital number, since it uses as much as digits as its factorization.

64718881709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5419008, while the sum is 59.

The spelling of 64718881709 in words is "sixty-four billion, seven hundred eighteen million, eight hundred eighty-one thousand, seven hundred nine".