66670727 has 2 divisors, whose sum is σ = 66670728. Its totient is φ = 66670726.

The previous prime is 66670717. The next prime is 66670729. The reversal of 66670727 is 72707666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66670727 - 2¹² = 66666631 is a prime.

Together with 66670729, 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 (66670729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335363 + 33335364.

It is an arithmetic number, because the mean of its divisors is an integer number (33335364).

Almost surely, 2^66670727 is an apocalyptic number.

66670727 is a deficient number, since it is larger than the sum of its proper divisors (1).

66670727 is an equidigital number, since it uses as much as digits as its factorization.

66670727 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 41.

The square root of 66670727 is about 8165.2144491128. The cubic root of 66670727 is about 405.4883647936.

The spelling of 66670727 in words is "sixty-six million, six hundred seventy thousand, seven hundred twenty-seven".