6855891865880 has 32 divisors (see below), whose sum is σ = 15431994590400. Its totient is φ = 2741247787776.

The previous prime is 6855891865877. The next prime is 6855891865909. The reversal of 6855891865880 is 885681985586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34554800 + ... + 34752639.

It is an arithmetic number, because the mean of its divisors is an integer number (482249830950).

Almost surely, 2^{6855891865880} is an apocalyptic number.

It is an amenable number.

6855891865880 is an abundant number, since it is smaller than the sum of its proper divisors (8576102724520).

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

6855891865880 is a wasteful number, since it uses less digits than its factorization.

6855891865880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69309923 (or 69309919 counting only the distinct ones).

The product of its (nonzero) digits is 1327104000, while the sum is 77.

The spelling of 6855891865880 in words is "six trillion, eight hundred fifty-five billion, eight hundred ninety-one million, eight hundred sixty-five thousand, eight hundred eighty".