64817660224391 has 2 divisors, whose sum is σ = 64817660224392. Its totient is φ = 64817660224390.

The previous prime is 64817660224357. The next prime is 64817660224441. The reversal of 64817660224391 is 19342206671846.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64817660224391 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64817660224391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64817660223391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32408830112195 + 32408830112196.

It is an arithmetic number, because the mean of its divisors is an integer number (32408830112196).

Almost surely, 2^{64817660224391} is an apocalyptic number.

64817660224391 is a deficient number, since it is larger than the sum of its proper divisors (1).

64817660224391 is an equidigital number, since it uses as much as digits as its factorization.

64817660224391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20901888, while the sum is 59.

The spelling of 64817660224391 in words is "sixty-four trillion, eight hundred seventeen billion, six hundred sixty million, two hundred twenty-four thousand, three hundred ninety-one".