66720107 has 2 divisors, whose sum is σ = 66720108. Its totient is φ = 66720106.

The previous prime is 66720103. The next prime is 66720109. The reversal of 66720107 is 70102766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66720107 - 2² = 66720103 is a prime.

Together with 66720109, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66720107.

It is not a weakly prime, because it can be changed into another prime (66720103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33360053 + 33360054.

It is an arithmetic number, because the mean of its divisors is an integer number (33360054).

Almost surely, 2^66720107 is an apocalyptic number.

66720107 is a deficient number, since it is larger than the sum of its proper divisors (1).

66720107 is an equidigital number, since it uses as much as digits as its factorization.

66720107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 66720107 is about 8168.2376924279. The cubic root of 66720107 is about 405.5884490685.

The spelling of 66720107 in words is "sixty-six million, seven hundred twenty thousand, one hundred seven".