6991838648448 has 128 divisors (see below), whose sum is σ = 19173778391040. Its totient is φ = 2255125017600.

The previous prime is 6991838648437. The next prime is 6991838648453. The reversal of 6991838648448 is 8448468381996.

It is a tau number, because it is divible by the number of its divisors (128).

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 15 ways as a sum of consecutive naturals, for example, 97469811 + ... + 97541517.

It is an arithmetic number, because the mean of its divisors is an integer number (149795143680).

Almost surely, 2^{6991838648448} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6991838648448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9586889195520).

6991838648448 is an abundant number, since it is smaller than the sum of its proper divisors (12181939742592).

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

6991838648448 is a wasteful number, since it uses less digits than its factorization.

6991838648448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79946 (or 79934 counting only the distinct ones).

The product of its digits is 2293235712, while the sum is 78.

The spelling of 6991838648448 in words is "six trillion, nine hundred ninety-one billion, eight hundred thirty-eight million, six hundred forty-eight thousand, four hundred forty-eight".