6644203640 has 16 divisors (see below), whose sum is σ = 14949458280. Its totient is φ = 2657681440.

The previous prime is 6644203633. The next prime is 6644203691. The reversal of 6644203640 is 463024466.

It is a self number, because there is not a number n which added to its sum of digits gives 6644203640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83052506 + ... + 83052585.

Almost surely, 2^6644203640 is an apocalyptic number.

It is an amenable number.

6644203640 is an abundant number, since it is smaller than the sum of its proper divisors (8305254640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6644203640 is a wasteful number, since it uses less digits than its factorization.

6644203640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166105102 (or 166105098 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 35.

The square root of 6644203640 is about 81511.9846402969. The cubic root of 6644203640 is about 1879.9558273913.

The spelling of 6644203640 in words is "six billion, six hundred forty-four million, two hundred three thousand, six hundred forty".