64788714721 has 2 divisors, whose sum is σ = 64788714722. Its totient is φ = 64788714720.

The previous prime is 64788714703. The next prime is 64788714827. The reversal of 64788714721 is 12741788746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63788574096 + 1000140625 = 252564^2 + 31625^2 .

It is a cyclic number.

It is not a de Polignac number, because 64788714721 - 2⁵ = 64788714689 is a prime.

It is not a weakly prime, because it can be changed into another prime (64788715721) 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, 32394357360 + 32394357361.

It is an arithmetic number, because the mean of its divisors is an integer number (32394357361).

Almost surely, 2^64788714721 is an apocalyptic number.

It is an amenable number.

64788714721 is a deficient number, since it is larger than the sum of its proper divisors (1).

64788714721 is an equidigital number, since it uses as much as digits as its factorization.

64788714721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4214784, while the sum is 55.

The spelling of 64788714721 in words is "sixty-four billion, seven hundred eighty-eight million, seven hundred fourteen thousand, seven hundred twenty-one".