64967928965 has 4 divisors (see below), whose sum is σ = 77961514764. Its totient is φ = 51974343168.

The previous prime is 64967928947. The next prime is 64967929003. The reversal of 64967928965 is 56982976946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10637447044 + 54330481921 = 103138^2 + 233089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64967928965 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 6496792892 + ... + 6496792901.

It is an arithmetic number, because the mean of its divisors is an integer number (19490378691).

Almost surely, 2^64967928965 is an apocalyptic number.

It is an amenable number.

64967928965 is a deficient number, since it is larger than the sum of its proper divisors (12993585799).

64967928965 is a wasteful number, since it uses less digits than its factorization.

64967928965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12993585798.

The product of its digits is 352719360, while the sum is 71.

The spelling of 64967928965 in words is "sixty-four billion, nine hundred sixty-seven million, nine hundred twenty-eight thousand, nine hundred sixty-five".