64688688646 has 8 divisors (see below), whose sum is σ = 97039621800. Its totient is φ = 32342148048.

The previous prime is 64688688641. The next prime is 64688688671.

64688688646 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64688688641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061071 + ... + 1120378.

It is an arithmetic number, because the mean of its divisors is an integer number (12129952725).

Almost surely, 2^64688688646 is an apocalyptic number.

64688688646 is a deficient number, since it is larger than the sum of its proper divisors (32350933154).

64688688646 is a wasteful number, since it uses less digits than its factorization.

64688688646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196278.

The product of its digits is 509607936, while the sum is 70.

The spelling of 64688688646 in words is "sixty-four billion, six hundred eighty-eight million, six hundred eighty-eight thousand, six hundred forty-six".