6691218044 has 12 divisors (see below), whose sum is σ = 13382436144. Its totient is φ = 2867664864.

The previous prime is 6691217993. The next prime is 6691218067. The reversal of 6691218044 is 4408121966.

6691218044 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 6691217992 and 6691218010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119486009 + ... + 119486064.

It is an arithmetic number, because the mean of its divisors is an integer number (1115203012).

Almost surely, 2^6691218044 is an apocalyptic number.

It is an amenable number.

6691218044 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6691218044 is a wasteful number, since it uses less digits than its factorization.

6691218044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238972084 (or 238972082 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 6691218044 is about 81799.8657945109. The cubic root of 6691218044 is about 1884.3796004713.

The spelling of 6691218044 in words is "six billion, six hundred ninety-one million, two hundred eighteen thousand, forty-four".