64685909319989 has 16 divisors (see below), whose sum is σ = 67261124736000. Its totient is φ = 62134174784640.

The previous prime is 64685909319923. The next prime is 64685909319991. The reversal of 64685909319989 is 98991390958646.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64685909319989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64685909319989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64685909349989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2710049 + ... + 11692569.

It is an arithmetic number, because the mean of its divisors is an integer number (4203820296000).

Almost surely, 2^{64685909319989} is an apocalyptic number.

It is an amenable number.

64685909319989 is a deficient number, since it is larger than the sum of its proper divisors (2575215416011).

64685909319989 is a wasteful number, since it uses less digits than its factorization.

64685909319989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8983828.

The product of its (nonzero) digits is 8162933760, while the sum is 86.

The spelling of 64685909319989 in words is "sixty-four trillion, six hundred eighty-five billion, nine hundred nine million, three hundred nineteen thousand, nine hundred eighty-nine".