6656646413393 has 2 divisors, whose sum is σ = 6656646413394. Its totient is φ = 6656646413392.

The previous prime is 6656646413369. The next prime is 6656646413401. The reversal of 6656646413393 is 3933146466566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5296957486144 + 1359688927249 = 2301512^2 + 1166057^2 .

It is a cyclic number.

It is not a de Polignac number, because 6656646413393 - 2¹⁸ = 6656646151249 is a prime.

It is not a weakly prime, because it can be changed into another prime (6656646413303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3328323206696 + 3328323206697.

It is an arithmetic number, because the mean of its divisors is an integer number (3328323206697).

Almost surely, 2^{6656646413393} is an apocalyptic number.

It is an amenable number.

6656646413393 is a deficient number, since it is larger than the sum of its proper divisors (1).

6656646413393 is an equidigital number, since it uses as much as digits as its factorization.

6656646413393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151165440, while the sum is 62.

The spelling of 6656646413393 in words is "six trillion, six hundred fifty-six billion, six hundred forty-six million, four hundred thirteen thousand, three hundred ninety-three".