6661443147739 has 2 divisors, whose sum is σ = 6661443147740. Its totient is φ = 6661443147738.

The previous prime is 6661443147571. The next prime is 6661443147773. The reversal of 6661443147739 is 9377413441666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6661443147739 - 2¹¹ = 6661443145691 is a prime.

It is not a weakly prime, because it can be changed into another prime (6661443147539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330721573869 + 3330721573870.

It is an arithmetic number, because the mean of its divisors is an integer number (3330721573870).

Almost surely, 2^{6661443147739} is an apocalyptic number.

6661443147739 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661443147739 is an equidigital number, since it uses as much as digits as its factorization.

6661443147739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54867456, while the sum is 61.

The spelling of 6661443147739 in words is "six trillion, six hundred sixty-one billion, four hundred forty-three million, one hundred forty-seven thousand, seven hundred thirty-nine".