66708407 has 2 divisors, whose sum is σ = 66708408. Its totient is φ = 66708406.

The previous prime is 66708403. The next prime is 66708419. The reversal of 66708407 is 70480766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66708407 - 2² = 66708403 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66708403) 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, 33354203 + 33354204.

It is an arithmetic number, because the mean of its divisors is an integer number (33354204).

Almost surely, 2^66708407 is an apocalyptic number.

66708407 is a deficient number, since it is larger than the sum of its proper divisors (1).

66708407 is an equidigital number, since it uses as much as digits as its factorization.

66708407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 66708407 is about 8167.5214722705. The cubic root of 66708407 is about 405.5647397627.

The spelling of 66708407 in words is "sixty-six million, seven hundred eight thousand, four hundred seven".