64793409221 has 16 divisors (see below), whose sum is σ = 69093486000. Its totient is φ = 60548579328.

The previous prime is 64793409209. The next prime is 64793409271. The reversal of 64793409221 is 12290439746.

It can be written as a sum of positive squares in 8 ways, for example, as 6113676100 + 58679733121 = 78190^2 + 242239^2 .

It is a cyclic number.

It is not a de Polignac number, because 64793409221 - 2⁶ = 64793409157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64793409271) 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, 2247305 + ... + 2275953.

It is an arithmetic number, because the mean of its divisors is an integer number (4318342875).

Almost surely, 2^64793409221 is an apocalyptic number.

It is an amenable number.

64793409221 is a deficient number, since it is larger than the sum of its proper divisors (4300076779).

64793409221 is a wasteful number, since it uses less digits than its factorization.

64793409221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29608.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 64793409221 in words is "sixty-four billion, seven hundred ninety-three million, four hundred nine thousand, two hundred twenty-one".