64044266221 has 8 divisors (see below), whose sum is σ = 69175413944. Its totient is φ = 58942356480.

The previous prime is 64044266173. The next prime is 64044266227. The reversal of 64044266221 is 12266244046.

It can be written as a sum of positive squares in 4 ways, for example, as 8354874025 + 55689392196 = 91405^2 + 235986^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 64044266221 - 2⁹ = 64044265709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64044266227) 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 7 ways as a sum of consecutive naturals, for example, 7304940 + ... + 7313701.

It is an arithmetic number, because the mean of its divisors is an integer number (8646926743).

Almost surely, 2^64044266221 is an apocalyptic number.

It is an amenable number.

64044266221 is a deficient number, since it is larger than the sum of its proper divisors (5131147723).

64044266221 is a wasteful number, since it uses less digits than its factorization.

64044266221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14618991.

The product of its (nonzero) digits is 110592, while the sum is 37.

The spelling of 64044266221 in words is "sixty-four billion, forty-four million, two hundred sixty-six thousand, two hundred twenty-one".