64581708394979 has 2 divisors, whose sum is σ = 64581708394980. Its totient is φ = 64581708394978.

The previous prime is 64581708394837. The next prime is 64581708395053. The reversal of 64581708394979 is 97949380718546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64581708394979 - 2²⁸ = 64581439959523 is a prime.

It is not a weakly prime, because it can be changed into another prime (64581708304979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32290854197489 + 32290854197490.

It is an arithmetic number, because the mean of its divisors is an integer number (32290854197490).

Almost surely, 2^{64581708394979} is an apocalyptic number.

64581708394979 is a deficient number, since it is larger than the sum of its proper divisors (1).

64581708394979 is an equidigital number, since it uses as much as digits as its factorization.

64581708394979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3292047360, while the sum is 80.

The spelling of 64581708394979 in words is "sixty-four trillion, five hundred eighty-one billion, seven hundred eight million, three hundred ninety-four thousand, nine hundred seventy-nine".