6618446644 has 12 divisors (see below), whose sum is σ = 11588038084. Its totient is φ = 3307578624.

The previous prime is 6618446561. The next prime is 6618446651. The reversal of 6618446644 is 4466448166.

It can be written as a sum of positive squares in 2 ways, for example, as 5123696400 + 1494750244 = 71580^2 + 38662^2 .

It is a congruent number.

It is an unprimeable number.

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, 402099 + ... + 418234.

Almost surely, 2^6618446644 is an apocalyptic number.

It is an amenable number.

6618446644 is a deficient number, since it is larger than the sum of its proper divisors (4969591440).

6618446644 is a wasteful number, since it uses less digits than its factorization.

6618446644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822354 (or 822352 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 49.

The square root of 6618446644 is about 81353.8360742749. The cubic root of 6618446644 is about 1877.5233953762.

The spelling of 6618446644 in words is "six billion, six hundred eighteen million, four hundred forty-six thousand, six hundred forty-four".