6644136236 has 24 divisors (see below), whose sum is σ = 11708001984. Its totient is φ = 3299026320.

The previous prime is 6644136229. The next prime is 6644136281. The reversal of 6644136236 is 6326314466.

It is a junction number, because it is equal to n+sod(n) for n = 6644136193 and 6644136202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 989651 + ... + 996341.

It is an arithmetic number, because the mean of its divisors is an integer number (487833416).

Almost surely, 2^6644136236 is an apocalyptic number.

It is an amenable number.

6644136236 is a deficient number, since it is larger than the sum of its proper divisors (5063865748).

6644136236 is a wasteful number, since it uses less digits than its factorization.

6644136236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8381 (or 8379 counting only the distinct ones).

The product of its digits is 373248, while the sum is 41.

The square root of 6644136236 is about 81511.5711785756. The cubic root of 6644136236 is about 1879.9494701222.

The spelling of 6644136236 in words is "six billion, six hundred forty-four million, one hundred thirty-six thousand, two hundred thirty-six".