6991771848 has 32 divisors (see below), whose sum is σ = 18399400800. Its totient is φ = 2207927808.

The previous prime is 6991771823. The next prime is 6991771877. The reversal of 6991771848 is 8481771996.

It is a junction number, because it is equal to n+sod(n) for n = 6991771791 and 6991771800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7665961 + ... + 7666872.

It is an arithmetic number, because the mean of its divisors is an integer number (574981275).

Almost surely, 2^6991771848 is an apocalyptic number.

It is an amenable number.

6991771848 is an abundant number, since it is smaller than the sum of its proper divisors (11407628952).

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

6991771848 is a wasteful number, since it uses less digits than its factorization.

6991771848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15332861 (or 15332857 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 60.

The square root of 6991771848 is about 83616.8155815563. The cubic root of 6991771848 is about 1912.1813704048.

The spelling of 6991771848 in words is "six billion, nine hundred ninety-one million, seven hundred seventy-one thousand, eight hundred forty-eight".