6271998644 has 12 divisors (see below), whose sum is σ = 11056115364. Its totient is φ = 3113108544.

The previous prime is 6271998643. The next prime is 6271998659. The reversal of 6271998644 is 4468991726.

It can be written as a sum of positive squares in 2 ways, for example, as 4171609744 + 2100388900 = 64588^2 + 45830^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6271998644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6271998643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5722079 + ... + 5723174.

It is an arithmetic number, because the mean of its divisors is an integer number (921342947).

Almost surely, 2^6271998644 is an apocalyptic number.

It is an amenable number.

6271998644 is a deficient number, since it is larger than the sum of its proper divisors (4784116720).

6271998644 is a wasteful number, since it uses less digits than its factorization.

6271998644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11445394 (or 11445392 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 56.

The square root of 6271998644 is about 79195.9509318500. The cubic root of 6271998644 is about 1844.1743839205.

The spelling of 6271998644 in words is "six billion, two hundred seventy-one million, nine hundred ninety-eight thousand, six hundred forty-four".