64220532913 has 2 divisors, whose sum is σ = 64220532914. Its totient is φ = 64220532912.

The previous prime is 64220532907. The next prime is 64220532991. The reversal of 64220532913 is 31923502246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47374569649 + 16845963264 = 217657^2 + 129792^2 .

It is a cyclic number.

It is not a de Polignac number, because 64220532913 - 2⁹ = 64220532401 is a prime.

It is not a weakly prime, because it can be changed into another prime (64220532113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32110266456 + 32110266457.

It is an arithmetic number, because the mean of its divisors is an integer number (32110266457).

Almost surely, 2^64220532913 is an apocalyptic number.

It is an amenable number.

64220532913 is a deficient number, since it is larger than the sum of its proper divisors (1).

64220532913 is an equidigital number, since it uses as much as digits as its factorization.

64220532913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 64220532913 in words is "sixty-four billion, two hundred twenty million, five hundred thirty-two thousand, nine hundred thirteen".