6668919650389 has 2 divisors, whose sum is σ = 6668919650390. Its totient is φ = 6668919650388.

The previous prime is 6668919650339. The next prime is 6668919650429. The reversal of 6668919650389 is 9830569198666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4441273849489 + 2227645800900 = 2107433^2 + 1492530^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668919650389 - 2¹⁵ = 6668919617621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6668919650339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334459825194 + 3334459825195.

It is an arithmetic number, because the mean of its divisors is an integer number (3334459825195).

Almost surely, 2^{6668919650389} is an apocalyptic number.

It is an amenable number.

6668919650389 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668919650389 is an equidigital number, since it uses as much as digits as its factorization.

6668919650389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 906992640, while the sum is 76.

The spelling of 6668919650389 in words is "six trillion, six hundred sixty-eight billion, nine hundred nineteen million, six hundred fifty thousand, three hundred eighty-nine".