66830591 has 2 divisors, whose sum is σ = 66830592. Its totient is φ = 66830590.

The previous prime is 66830549. The next prime is 66830593. The reversal of 66830591 is 19503866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66830591 - 2⁶ = 66830527 is a prime.

Together with 66830593, 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 (66830593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33415295 + 33415296.

It is an arithmetic number, because the mean of its divisors is an integer number (33415296).

Almost surely, 2^66830591 is an apocalyptic number.

66830591 is a deficient number, since it is larger than the sum of its proper divisors (1).

66830591 is an equidigital number, since it uses as much as digits as its factorization.

66830591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 66830591 is about 8174.9979204890. The cubic root of 66830591 is about 405.8122013188.

The spelling of 66830591 in words is "sixty-six million, eight hundred thirty thousand, five hundred ninety-one".