6997355920 has 20 divisors (see below), whose sum is σ = 16268852700. Its totient is φ = 2798942336.

The previous prime is 6997355917. The next prime is 6997355921. The reversal of 6997355920 is 295537996.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3101598864 + 3895757056 = 55692^2 + 62416^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (6997355921) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 43733395 + ... + 43733554.

It is an arithmetic number, because the mean of its divisors is an integer number (813442635).

Almost surely, 2^6997355920 is an apocalyptic number.

It is an amenable number.

6997355920 is an abundant number, since it is smaller than the sum of its proper divisors (9271496780).

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

6997355920 is a wasteful number, since it uses less digits than its factorization.

6997355920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87466962 (or 87466956 counting only the distinct ones).

The product of its (nonzero) digits is 4592700, while the sum is 55.

The square root of 6997355920 is about 83650.1997606700. The cubic root of 6997355920 is about 1912.6902980079.

The spelling of 6997355920 in words is "six billion, nine hundred ninety-seven million, three hundred fifty-five thousand, nine hundred twenty".