6644862008 has 16 divisors (see below), whose sum is σ = 12522363480. Its totient is φ = 3305565088.

The previous prime is 6644861957. The next prime is 6644862061. The reversal of 6644862008 is 8002684466.

It is a super-2 number, since 2×6644862008² = 88308382210723584128, 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 6644862008.

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, 2106566 + ... + 2109717.

Almost surely, 2^6644862008 is an apocalyptic number.

It is an amenable number.

6644862008 is a deficient number, since it is larger than the sum of its proper divisors (5877501472).

6644862008 is a wasteful number, since it uses less digits than its factorization.

6644862008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4216486 (or 4216482 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 44.

The square root of 6644862008 is about 81516.0230138836. The cubic root of 6644862008 is about 1880.0179197024.

The spelling of 6644862008 in words is "six billion, six hundred forty-four million, eight hundred sixty-two thousand, eight".