6991225056 has 36 divisors (see below), whose sum is σ = 19881297072. Its totient is φ = 2330408256.

The previous prime is 6991225039. The next prime is 6991225079. The reversal of 6991225056 is 6505221996.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12137256 + ... + 12137831.

It is an arithmetic number, because the mean of its divisors is an integer number (552258252).

Almost surely, 2^6991225056 is an apocalyptic number.

It is an amenable number.

6991225056 is an abundant number, since it is smaller than the sum of its proper divisors (12890072016).

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

6991225056 is a wasteful number, since it uses less digits than its factorization.

6991225056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24275103 (or 24275092 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 6991225056 is about 83613.5458882112. The cubic root of 6991225056 is about 1912.1315216799.

The spelling of 6991225056 in words is "six billion, nine hundred ninety-one million, two hundred twenty-five thousand, fifty-six".