64186344643648 has 28 divisors (see below), whose sum is σ = 127690608376972. Its totient is φ = 32012333084160.

The previous prime is 64186344643627. The next prime is 64186344643679. The reversal of 64186344643648 is 84634644368146.

It can be written as a sum of positive squares in 2 ways, for example, as 48242359531584 + 15943985112064 = 6945672^2 + 3992992^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1263087483 + ... + 1263138298.

Almost surely, 2^{64186344643648} is an apocalyptic number.

It is an amenable number.

64186344643648 is a deficient number, since it is larger than the sum of its proper divisors (63504263733324).

64186344643648 is a wasteful number, since it uses less digits than its factorization.

64186344643648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526226190 (or 2526226180 counting only the distinct ones).

The product of its digits is 764411904, while the sum is 67.

The spelling of 64186344643648 in words is "sixty-four trillion, one hundred eighty-six billion, three hundred forty-four million, six hundred forty-three thousand, six hundred forty-eight".