66666827 has 2 divisors, whose sum is σ = 66666828. Its totient is φ = 66666826.

The previous prime is 66666793. The next prime is 66666829. The reversal of 66666827 is 72866666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66666827 - 2¹⁰ = 66665803 is a prime.

Together with 66666829, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66666829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333413 + 33333414.

It is an arithmetic number, because the mean of its divisors is an integer number (33333414).

Almost surely, 2^66666827 is an apocalyptic number.

66666827 is a deficient number, since it is larger than the sum of its proper divisors (1).

66666827 is an equidigital number, since it uses as much as digits as its factorization.

66666827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The square root of 66666827 is about 8164.9756276427. The cubic root of 66666827 is about 405.4804580979.

The spelling of 66666827 in words is "sixty-six million, six hundred sixty-six thousand, eight hundred twenty-seven".