64708964785909 has 2 divisors, whose sum is σ = 64708964785910. Its totient is φ = 64708964785908.

The previous prime is 64708964785807. The next prime is 64708964785939. The reversal of 64708964785909 is 90958746980746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58197521412900 + 6511443373009 = 7628730^2 + 2551753^2 .

It is a cyclic number.

It is not a de Polignac number, because 64708964785909 - 2¹⁹ = 64708964261621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64708964785939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32354482392954 + 32354482392955.

It is an arithmetic number, because the mean of its divisors is an integer number (32354482392955).

Almost surely, 2^{64708964785909} is an apocalyptic number.

It is an amenable number.

64708964785909 is a deficient number, since it is larger than the sum of its proper divisors (1).

64708964785909 is an equidigital number, since it uses as much as digits as its factorization.

64708964785909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6584094720, while the sum is 82.

The spelling of 64708964785909 in words is "sixty-four trillion, seven hundred eight billion, nine hundred sixty-four million, seven hundred eighty-five thousand, nine hundred nine".