66656927 has 2 divisors, whose sum is σ = 66656928. Its totient is φ = 66656926.

The previous prime is 66656911. The next prime is 66656929. The reversal of 66656927 is 72965666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66656927 - 2⁴ = 66656911 is a prime.

Together with 66656929, 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 (66656929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33328463 + 33328464.

It is an arithmetic number, because the mean of its divisors is an integer number (33328464).

Almost surely, 2^66656927 is an apocalyptic number.

66656927 is a deficient number, since it is larger than the sum of its proper divisors (1).

66656927 is an equidigital number, since it uses as much as digits as its factorization.

66656927 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 47.

The square root of 66656927 is about 8164.3693571518. The cubic root of 66656927 is about 405.4603858699.

The spelling of 66656927 in words is "sixty-six million, six hundred fifty-six thousand, nine hundred twenty-seven".