6666667666541 has 2 divisors, whose sum is σ = 6666667666542. Its totient is φ = 6666667666540.

The previous prime is 6666667666489. The next prime is 6666667666553. The reversal of 6666667666541 is 1456667666666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5969451016516 + 697216650025 = 2443246^2 + 834995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666667666541 is a prime.

It is a super-2 number, since 2×6666667666541² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666667666591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333333833270 + 3333333833271.

It is an arithmetic number, because the mean of its divisors is an integer number (3333333833271).

Almost surely, 2^{6666667666541} is an apocalyptic number.

It is an amenable number.

6666667666541 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666667666541 is an equidigital number, since it uses as much as digits as its factorization.

6666667666541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1410877440, while the sum is 71.

The spelling of 6666667666541 in words is "six trillion, six hundred sixty-six billion, six hundred sixty-seven million, six hundred sixty-six thousand, five hundred forty-one".