6221506643 has 16 divisors (see below), whose sum is σ = 7353472896. Its totient is φ = 5199411840.

The previous prime is 6221506637. The next prime is 6221506651. The reversal of 6221506643 is 3466051226.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6221506643 - 2²⁶ = 6154397779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6221506843) 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, 378821 + ... + 394902.

It is an arithmetic number, because the mean of its divisors is an integer number (459592056).

Almost surely, 2^6221506643 is an apocalyptic number.

6221506643 is a deficient number, since it is larger than the sum of its proper divisors (1131966253).

6221506643 is a wasteful number, since it uses less digits than its factorization.

6221506643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773794.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 6221506643 is about 78876.5278330632. The cubic root of 6221506643 is about 1839.2122733790.

Adding to 6221506643 its reverse (3466051226), we get a palindrome (9687557869).

The spelling of 6221506643 in words is "six billion, two hundred twenty-one million, five hundred six thousand, six hundred forty-three".