6687195857 has 2 divisors, whose sum is σ = 6687195858. Its totient is φ = 6687195856.

The previous prime is 6687195833. The next prime is 6687195883. The reversal of 6687195857 is 7585917866.

6687195857 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5904539281 + 782656576 = 76841^2 + 27976^2 .

It is a cyclic number.

It is not a de Polignac number, because 6687195857 - 2¹⁶ = 6687130321 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6687195857.

It is not a weakly prime, because it can be changed into another prime (6687198857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343597928 + 3343597929.

It is an arithmetic number, because the mean of its divisors is an integer number (3343597929).

Almost surely, 2^6687195857 is an apocalyptic number.

It is an amenable number.

6687195857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6687195857 is an equidigital number, since it uses as much as digits as its factorization.

6687195857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25401600, while the sum is 62.

The square root of 6687195857 is about 81775.2765632743. The cubic root of 6687195857 is about 1884.0019489351.

The spelling of 6687195857 in words is "six billion, six hundred eighty-seven million, one hundred ninety-five thousand, eight hundred fifty-seven".