6885555881 has 2 divisors, whose sum is σ = 6885555882. Its totient is φ = 6885555880.

The previous prime is 6885555841. The next prime is 6885555889. The reversal of 6885555881 is 1885555886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6409443481 + 476112400 = 80059^2 + 21820^2 .

It is a cyclic number.

It is not a de Polignac number, because 6885555881 - 2¹⁰ = 6885554857 is a prime.

It is a super-2 number, since 2×6885555881² = 94821759580747372322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6885555881.

It is not a weakly prime, because it can be changed into another prime (6885555889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3442777940 + 3442777941.

It is an arithmetic number, because the mean of its divisors is an integer number (3442777941).

Almost surely, 2^6885555881 is an apocalyptic number.

It is an amenable number.

6885555881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6885555881 is an equidigital number, since it uses as much as digits as its factorization.

6885555881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360000, while the sum is 59.

The square root of 6885555881 is about 82979.2497013561. The cubic root of 6885555881 is about 1902.4489088212.

The spelling of 6885555881 in words is "six billion, eight hundred eighty-five million, five hundred fifty-five thousand, eight hundred eighty-one".