64317664221 has 16 divisors (see below), whose sum is σ = 90809558784. Its totient is φ = 40352559104.

The previous prime is 64317664111. The next prime is 64317664231. The reversal of 64317664221 is 12246671346.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64317664221 - 2¹⁹ = 64317139933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64317664231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 588541 + ... + 689213.

It is an arithmetic number, because the mean of its divisors is an integer number (5675597424).

Almost surely, 2^64317664221 is an apocalyptic number.

It is an amenable number.

64317664221 is a deficient number, since it is larger than the sum of its proper divisors (26491894563).

64317664221 is a wasteful number, since it uses less digits than its factorization.

64317664221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113220.

The product of its digits is 290304, while the sum is 42.

The spelling of 64317664221 in words is "sixty-four billion, three hundred seventeen million, six hundred sixty-four thousand, two hundred twenty-one".