6666641141749 has 2 divisors, whose sum is σ = 6666641141750. Its totient is φ = 6666641141748.

The previous prime is 6666641141747. The next prime is 6666641141759. The reversal of 6666641141749 is 9471411466666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5256679635025 + 1409961506724 = 2292745^2 + 1187418^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666641141749 - 2¹ = 6666641141747 is a prime.

It is a super-2 number, since 2×6666641141749² (a number of 26 digits) contains 22 as substring.

Together with 6666641141747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666641141747) 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, 3333320570874 + 3333320570875.

It is an arithmetic number, because the mean of its divisors is an integer number (3333320570875).

Almost surely, 2^{6666641141749} is an apocalyptic number.

It is an amenable number.

6666641141749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666641141749 is an equidigital number, since it uses as much as digits as its factorization.

6666641141749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31352832, while the sum is 61.

The spelling of 6666641141749 in words is "six trillion, six hundred sixty-six billion, six hundred forty-one million, one hundred forty-one thousand, seven hundred forty-nine".