6221522644 has 6 divisors (see below), whose sum is σ = 10887664634. Its totient is φ = 3110761320.

The previous prime is 6221522641. The next prime is 6221522677. The reversal of 6221522644 is 4462251226.

It can be written as a sum of positive squares in only one way, i.e., 4043433744 + 2178088900 = 63588^2 + 46670^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6221522641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777690327 + ... + 777690334.

Almost surely, 2^6221522644 is an apocalyptic number.

It is an amenable number.

6221522644 is a deficient number, since it is larger than the sum of its proper divisors (4666141990).

6221522644 is a wasteful number, since it uses less digits than its factorization.

6221522644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555380665 (or 1555380663 counting only the distinct ones).

The product of its digits is 46080, while the sum is 34.

The square root of 6221522644 is about 78876.6292636799. The cubic root of 6221522644 is about 1839.2138501252.

The spelling of 6221522644 in words is "six billion, two hundred twenty-one million, five hundred twenty-two thousand, six hundred forty-four".