6643913004161 has 2 divisors, whose sum is σ = 6643913004162. Its totient is φ = 6643913004160.

The previous prime is 6643913004149. The next prime is 6643913004229. The reversal of 6643913004161 is 1614003193466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5161438734400 + 1482474269761 = 2271880^2 + 1217569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6643913004161 is a prime.

It is not a weakly prime, because it can be changed into another prime (6643913004361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321956502080 + 3321956502081.

It is an arithmetic number, because the mean of its divisors is an integer number (3321956502081).

Almost surely, 2^{6643913004161} is an apocalyptic number.

It is an amenable number.

6643913004161 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643913004161 is an equidigital number, since it uses as much as digits as its factorization.

6643913004161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 6643913004161 in words is "six trillion, six hundred forty-three billion, nine hundred thirteen million, four thousand, one hundred sixty-one".