6666641141861 has 2 divisors, whose sum is σ = 6666641141862. Its totient is φ = 6666641141860.

The previous prime is 6666641141833. The next prime is 6666641141933. The reversal of 6666641141861 is 1681411466666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4105056896836 + 2561584245025 = 2026094^2 + 1600495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666641141861 is a prime.

It is a super-2 number, since 2×6666641141861² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6666641141797 and 6666641141806.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 3333320570930 + 3333320570931.

It is an arithmetic number, because the mean of its divisors is an integer number (3333320570931).

Almost surely, 2^{6666641141861} is an apocalyptic number.

It is an amenable number.

6666641141861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666641141861 is an equidigital number, since it uses as much as digits as its factorization.

6666641141861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5971968, while the sum is 56.

The spelling of 6666641141861 in words is "six trillion, six hundred sixty-six billion, six hundred forty-one million, one hundred forty-one thousand, eight hundred sixty-one".