64377815017 has 2 divisors, whose sum is σ = 64377815018. Its totient is φ = 64377815016.

The previous prime is 64377814999. The next prime is 64377815107. The reversal of 64377815017 is 71051877346.

Together with next prime (64377815107) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54091595776 + 10286219241 = 232576^2 + 101421^2 .

It is a cyclic number.

It is not a de Polignac number, because 64377815017 - 2⁷ = 64377814889 is a prime.

It is not a weakly prime, because it can be changed into another prime (64377815417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32188907508 + 32188907509.

It is an arithmetic number, because the mean of its divisors is an integer number (32188907509).

Almost surely, 2^64377815017 is an apocalyptic number.

It is an amenable number.

64377815017 is a deficient number, since it is larger than the sum of its proper divisors (1).

64377815017 is an equidigital number, since it uses as much as digits as its factorization.

64377815017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 987840, while the sum is 49.

The spelling of 64377815017 in words is "sixty-four billion, three hundred seventy-seven million, eight hundred fifteen thousand, seventeen".