6866257 has 2 divisors, whose sum is σ = 6866258. Its totient is φ = 6866256.

The previous prime is 6866191. The next prime is 6866263. The reversal of 6866257 is 7526686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6843456 + 22801 = 2616^2 + 151^2 .

It is a cyclic number.

It is not a de Polignac number, because 6866257 - 2⁷ = 6866129 is a prime.

6866257 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6866287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3433128 + 3433129.

It is an arithmetic number, because the mean of its divisors is an integer number (3433129).

Almost surely, 2^6866257 is an apocalyptic number.

It is an amenable number.

6866257 is a deficient number, since it is larger than the sum of its proper divisors (1).

6866257 is an equidigital number, since it uses as much as digits as its factorization.

6866257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 6866257 is about 2620.3543653483. The cubic root of 6866257 is about 190.0669846920.

The spelling of 6866257 in words is "six million, eight hundred sixty-six thousand, two hundred fifty-seven".