6881256566 has 16 divisors (see below), whose sum is σ = 11195619120. Its totient is φ = 3159256320.

The previous prime is 6881256523. The next prime is 6881256623. The reversal of 6881256566 is 6656521886.

It is a super-2 number, since 2×6881256566² = 94703383854236224712, which contains 22 as substring.

It is a congruent number.

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, 2466776 + ... + 2469563.

It is an arithmetic number, because the mean of its divisors is an integer number (699726195).

Almost surely, 2^6881256566 is an apocalyptic number.

6881256566 is a deficient number, since it is larger than the sum of its proper divisors (4314362554).

6881256566 is a wasteful number, since it uses less digits than its factorization.

6881256566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4936399.

The product of its digits is 4147200, while the sum is 53.

The square root of 6881256566 is about 82953.3396916604. The cubic root of 6881256566 is about 1902.0528657506.

The spelling of 6881256566 in words is "six billion, eight hundred eighty-one million, two hundred fifty-six thousand, five hundred sixty-six".