6887859257 has 2 divisors, whose sum is σ = 6887859258. Its totient is φ = 6887859256.

The previous prime is 6887859229. The next prime is 6887859263. The reversal of 6887859257 is 7529587886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6241632016 + 646227241 = 79004^2 + 25421^2 .

It is a cyclic number.

It is not a de Polignac number, because 6887859257 - 2¹⁰ = 6887858233 is a prime.

It is a super-3 number, since 3×6887859257³ (a number of 30 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6887859193 and 6887859202.

It is not a weakly prime, because it can be changed into another prime (6887859287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3443929628 + 3443929629.

It is an arithmetic number, because the mean of its divisors is an integer number (3443929629).

Almost surely, 2^6887859257 is an apocalyptic number.

It is an amenable number.

6887859257 is a deficient number, since it is larger than the sum of its proper divisors (1).

6887859257 is an equidigital number, since it uses as much as digits as its factorization.

6887859257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67737600, while the sum is 65.

The square root of 6887859257 is about 82993.1277697136. The cubic root of 6887859257 is about 1902.6610227348.

The spelling of 6887859257 in words is "six billion, eight hundred eighty-seven million, eight hundred fifty-nine thousand, two hundred fifty-seven".