2644365053621 has 16 divisors (see below), whose sum is σ = 2799335602800. Its totient is φ = 2494067616768.

The previous prime is 2644365053611. The next prime is 2644365053633. The reversal of 2644365053621 is 1263505634462.

2644365053621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1060819661521 + 1583545392100 = 1029961^2 + 1258390^2 .

It is a cyclic number.

It is not a de Polignac number, because 2644365053621 - 2⁶ = 2644365053557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644365053611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3404516 + ... + 4108461.

It is an arithmetic number, because the mean of its divisors is an integer number (174958475175).

Almost surely, 2^{2644365053621} is an apocalyptic number.

It is an amenable number.

2644365053621 is a deficient number, since it is larger than the sum of its proper divisors (154970549179).

2644365053621 is a wasteful number, since it uses less digits than its factorization.

2644365053621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7513288.

The product of its (nonzero) digits is 3110400, while the sum is 47.

The spelling of 2644365053621 in words is "two trillion, six hundred forty-four billion, three hundred sixty-five million, fifty-three thousand, six hundred twenty-one".