2644164640321 has 8 divisors (see below), whose sum is σ = 2659550090400. Its totient is φ = 2628786008160.

The previous prime is 2644164640309. The next prime is 2644164640331. The reversal of 2644164640321 is 1230464614462.

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 2644164640321 - 2²³ = 2644156251713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2644164640331) 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, 925540 + ... + 2478901.

It is an arithmetic number, because the mean of its divisors is an integer number (332443761300).

Almost surely, 2^{2644164640321} is an apocalyptic number.

It is an amenable number.

2644164640321 is a deficient number, since it is larger than the sum of its proper divisors (15385450079).

2644164640321 is a wasteful number, since it uses less digits than its factorization.

2644164640321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3408959.

The product of its (nonzero) digits is 663552, while the sum is 43.

The spelling of 2644164640321 in words is "two trillion, six hundred forty-four billion, one hundred sixty-four million, six hundred forty thousand, three hundred twenty-one".