64043664663 has 16 divisors (see below), whose sum is σ = 93226752000. Its totient is φ = 38784204480.

The previous prime is 64043664649. The next prime is 64043664683. The reversal of 64043664663 is 36646634046.

It is not a de Polignac number, because 64043664663 - 2¹⁸ = 64043402519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64043664623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 710263 + ... + 795336.

It is an arithmetic number, because the mean of its divisors is an integer number (5826672000).

Almost surely, 2^64043664663 is an apocalyptic number.

64043664663 is a deficient number, since it is larger than the sum of its proper divisors (29183087337).

64043664663 is a wasteful number, since it uses less digits than its factorization.

64043664663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506902.

The product of its (nonzero) digits is 4478976, while the sum is 48.

The spelling of 64043664663 in words is "sixty-four billion, forty-three million, six hundred sixty-four thousand, six hundred sixty-three".