6244655623621 has 4 divisors (see below), whose sum is σ = 6254102909644. Its totient is φ = 6235208337600.

The previous prime is 6244655623561. The next prime is 6244655623663. The reversal of 6244655623621 is 1263265564426.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4402921642596 + 1841733981025 = 2098314^2 + 1357105^2 .

It is a cyclic number.

It is not a de Polignac number, because 6244655623621 - 2¹¹ = 6244655621573 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 (6244655123621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4723642020 + ... + 4723643341.

It is an arithmetic number, because the mean of its divisors is an integer number (1563525727411).

Almost surely, 2^{6244655623621} is an apocalyptic number.

It is an amenable number.

6244655623621 is a deficient number, since it is larger than the sum of its proper divisors (9447286023).

6244655623621 is an equidigital number, since it uses as much as digits as its factorization.

6244655623621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9447286022.

The product of its digits is 12441600, while the sum is 52.

The spelling of 6244655623621 in words is "six trillion, two hundred forty-four billion, six hundred fifty-five million, six hundred twenty-three thousand, six hundred twenty-one".