6221436561 has 24 divisors (see below), whose sum is σ = 9101252160. Its totient is φ = 4094742816.

The previous prime is 6221436547. The next prime is 6221436563. The reversal of 6221436561 is 1656341226.

6221436561 is a `hidden beast` number, since 62 + 2 + 1 + 4 + 36 + 561 = 666.

It is not a de Polignac number, because 6221436561 - 2²¹ = 6219339409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6221436563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1723020 + ... + 1726626.

It is an arithmetic number, because the mean of its divisors is an integer number (379218840).

Almost surely, 2^6221436561 is an apocalyptic number.

It is an amenable number.

6221436561 is a deficient number, since it is larger than the sum of its proper divisors (2879815599).

6221436561 is a wasteful number, since it uses less digits than its factorization.

6221436561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6005 (or 6002 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 6221436561 is about 78876.0835805125. The cubic root of 6221436561 is about 1839.2053674334.

Adding to 6221436561 its reverse (1656341226), we get a palindrome (7877777787).

The spelling of 6221436561 in words is "six billion, two hundred twenty-one million, four hundred thirty-six thousand, five hundred sixty-one".