6656393 has 2 divisors, whose sum is σ = 6656394. Its totient is φ = 6656392.

The previous prime is 6656387. The next prime is 6656437. The reversal of 6656393 is 3936566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6615184 + 41209 = 2572^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 6656393 - 2¹⁴ = 6640009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6656893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328196 + 3328197.

It is an arithmetic number, because the mean of its divisors is an integer number (3328197).

Almost surely, 2^6656393 is an apocalyptic number.

It is an amenable number.

6656393 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656393 is an equidigital number, since it uses as much as digits as its factorization.

6656393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87480, while the sum is 38.

The square root of 6656393 is about 2579.9986434105. The cubic root of 6656393 is about 188.1104771665.

The spelling of 6656393 in words is "six million, six hundred fifty-six thousand, three hundred ninety-three".