64671601817 has 2 divisors, whose sum is σ = 64671601818. Its totient is φ = 64671601816.

The previous prime is 64671601711. The next prime is 64671601829. The reversal of 64671601817 is 71810617646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64422561856 + 249039961 = 253816^2 + 15781^2 .

It is a cyclic number.

It is not a de Polignac number, because 64671601817 - 2³⁴ = 47491732633 is a prime.

It is not a weakly prime, because it can be changed into another prime (64671601837) 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, 32335800908 + 32335800909.

It is an arithmetic number, because the mean of its divisors is an integer number (32335800909).

Almost surely, 2^64671601817 is an apocalyptic number.

It is an amenable number.

64671601817 is a deficient number, since it is larger than the sum of its proper divisors (1).

64671601817 is an equidigital number, since it uses as much as digits as its factorization.

64671601817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 47.

The spelling of 64671601817 in words is "sixty-four billion, six hundred seventy-one million, six hundred one thousand, eight hundred seventeen".