6644778888844 has 12 divisors (see below), whose sum is σ = 12240382163800. Its totient is φ = 3147526842048.

The previous prime is 6644778888779. The next prime is 6644778888973. The reversal of 6644778888844 is 4488888774466.

6644778888844 = T_2104720 + T_2104721 + T_2104722.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43715650509 + ... + 43715650660.

Almost surely, 2^{6644778888844} is an apocalyptic number.

6644778888844 is the 2104722-nd centered triangular number.

It is an amenable number.

6644778888844 is a deficient number, since it is larger than the sum of its proper divisors (5595603274956).

6644778888844 is a wasteful number, since it uses less digits than its factorization.

6644778888844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87431301192 (or 87431301190 counting only the distinct ones).

The product of its digits is 14797504512, while the sum is 82.

The spelling of 6644778888844 in words is "six trillion, six hundred forty-four billion, seven hundred seventy-eight million, eight hundred eighty-eight thousand, eight hundred forty-four".