6643554356 has 12 divisors (see below), whose sum is σ = 11635673280. Its totient is φ = 3319076280.

The previous prime is 6643554341. The next prime is 6643554361. The reversal of 6643554356 is 6534553466.

It is a super-2 number, since 2×6643554356² = 88273628962253149472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6643554356.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 669686 + ... + 679533.

It is an arithmetic number, because the mean of its divisors is an integer number (969639440).

Almost surely, 2^6643554356 is an apocalyptic number.

It is an amenable number.

6643554356 is a deficient number, since it is larger than the sum of its proper divisors (4992118924).

6643554356 is a wasteful number, since it uses less digits than its factorization.

6643554356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350454 (or 1350452 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 47.

The square root of 6643554356 is about 81508.0017912352. The cubic root of 6643554356 is about 1879.8945877972.

The spelling of 6643554356 in words is "six billion, six hundred forty-three million, five hundred fifty-four thousand, three hundred fifty-six".