66705659 has 2 divisors, whose sum is σ = 66705660. Its totient is φ = 66705658.

The previous prime is 66705629. The next prime is 66705673. The reversal of 66705659 is 95650766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66705659 - 2⁸ = 66705403 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66705629) 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, 33352829 + 33352830.

It is an arithmetic number, because the mean of its divisors is an integer number (33352830).

Almost surely, 2^66705659 is an apocalyptic number.

66705659 is a deficient number, since it is larger than the sum of its proper divisors (1).

66705659 is an equidigital number, since it uses as much as digits as its factorization.

66705659 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 44.

The square root of 66705659 is about 8167.3532432484. The cubic root of 66705659 is about 405.5591707134.

The spelling of 66705659 in words is "sixty-six million, seven hundred five thousand, six hundred fifty-nine".