66997127 has 2 divisors, whose sum is σ = 66997128. Its totient is φ = 66997126.

The previous prime is 66997123. The next prime is 66997129. The reversal of 66997127 is 72179966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66997127 - 2² = 66997123 is a prime.

Together with 66997129, 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 (66997123) 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, 33498563 + 33498564.

It is an arithmetic number, because the mean of its divisors is an integer number (33498564).

Almost surely, 2^66997127 is an apocalyptic number.

66997127 is a deficient number, since it is larger than the sum of its proper divisors (1).

66997127 is an equidigital number, since it uses as much as digits as its factorization.

66997127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 47.

The square root of 66997127 is about 8185.1772735842. The cubic root of 66997127 is about 406.1490045747.

The spelling of 66997127 in words is "sixty-six million, nine hundred ninety-seven thousand, one hundred twenty-seven".