6666641141261 has 2 divisors, whose sum is σ = 6666641141262. Its totient is φ = 6666641141260.

The previous prime is 6666641141243. The next prime is 6666641141273. The reversal of 6666641141261 is 1621411466666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5513014776361 + 1153626364900 = 2347981^2 + 1074070^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666641141261 - 2⁶ = 6666641141197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666641141161) 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, 3333320570630 + 3333320570631.

It is an arithmetic number, because the mean of its divisors is an integer number (3333320570631).

Almost surely, 2^{6666641141261} is an apocalyptic number.

It is an amenable number.

6666641141261 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666641141261 is an equidigital number, since it uses as much as digits as its factorization.

6666641141261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1492992, while the sum is 50.

The spelling of 6666641141261 in words is "six trillion, six hundred sixty-six billion, six hundred forty-one million, one hundred forty-one thousand, two hundred sixty-one".