64394617912 has 32 divisors (see below), whose sum is σ = 121093084800. Its totient is φ = 32103244800.

The previous prime is 64394617843. The next prime is 64394617921. The reversal of 64394617912 is 21971649346.

It is a self number, because there is not a number n which added to its sum of digits gives 64394617912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5055712 + ... + 5068432.

It is an arithmetic number, because the mean of its divisors is an integer number (3784158900).

Almost surely, 2^64394617912 is an apocalyptic number.

It is an amenable number.

64394617912 is a deficient number, since it is larger than the sum of its proper divisors (56698466888).

64394617912 is a wasteful number, since it uses less digits than its factorization.

64394617912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14527 (or 14523 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 52.

The spelling of 64394617912 in words is "sixty-four billion, three hundred ninety-four million, six hundred seventeen thousand, nine hundred twelve".