6881555720 has 64 divisors (see below), whose sum is σ = 16909482240. Its totient is φ = 2505081600.

The previous prime is 6881555719. The next prime is 6881555773. The reversal of 6881555720 is 275551886.

It is a happy number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

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 15 ways as a sum of consecutive naturals, for example, 56276 + ... + 130115.

It is an arithmetic number, because the mean of its divisors is an integer number (264210660).

Almost surely, 2^6881555720 is an apocalyptic number.

It is an amenable number.

6881555720 is an abundant number, since it is smaller than the sum of its proper divisors (10027926520).

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

6881555720 is a wasteful number, since it uses less digits than its factorization.

6881555720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186486 (or 186482 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 47.

The square root of 6881555720 is about 82955.1428182726. The cubic root of 6881555720 is about 1902.0804284723.

The spelling of 6881555720 in words is "six billion, eight hundred eighty-one million, five hundred fifty-five thousand, seven hundred twenty".