66666666672911 has 2 divisors, whose sum is σ = 66666666672912. Its totient is φ = 66666666672910.

The previous prime is 66666666672797. The next prime is 66666666672913. The reversal of 66666666672911 is 11927666666666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66666666672911 is a prime.

It is a super-2 number, since 2×66666666672911² (a number of 28 digits) contains 22 as substring.

Together with 66666666672913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66666666672913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333333336455 + 33333333336456.

It is an arithmetic number, because the mean of its divisors is an integer number (33333333336456).

Almost surely, 2^{66666666672911} is an apocalyptic number.

66666666672911 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666666672911 is an equidigital number, since it uses as much as digits as its factorization.

66666666672911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1269789696, while the sum is 74.

The spelling of 66666666672911 in words is "sixty-six trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred seventy-two thousand, nine hundred eleven".