6887366561 has 2 divisors, whose sum is σ = 6887366562. Its totient is φ = 6887366560.

The previous prime is 6887366557. The next prime is 6887366567. The reversal of 6887366561 is 1656637886.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4214476561 + 2672890000 = 64919^2 + 51700^2 .

It is a cyclic number.

It is not a de Polignac number, because 6887366561 - 2² = 6887366557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6887366497 and 6887366506.

It is not a weakly prime, because it can be changed into another prime (6887366567) by changing a digit.

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 as a sum of consecutive naturals, namely, 3443683280 + 3443683281.

It is an arithmetic number, because the mean of its divisors is an integer number (3443683281).

Almost surely, 2^6887366561 is an apocalyptic number.

It is an amenable number.

6887366561 is a deficient number, since it is larger than the sum of its proper divisors (1).

6887366561 is an equidigital number, since it uses as much as digits as its factorization.

6887366561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 56.

The square root of 6887366561 is about 82990.1594226689. The cubic root of 6887366561 is about 1902.6156551882.

The spelling of 6887366561 in words is "six billion, eight hundred eighty-seven million, three hundred sixty-six thousand, five hundred sixty-one".