66707447 has 2 divisors, whose sum is σ = 66707448. Its totient is φ = 66707446.

The previous prime is 66707441. The next prime is 66707467. The reversal of 66707447 is 74470766.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66707447 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 (66707441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33353723 + 33353724.

It is an arithmetic number, because the mean of its divisors is an integer number (33353724).

Almost surely, 2^66707447 is an apocalyptic number.

66707447 is a deficient number, since it is larger than the sum of its proper divisors (1).

66707447 is an equidigital number, since it uses as much as digits as its factorization.

66707447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 41.

The square root of 66707447 is about 8167.4627027003. The cubic root of 66707447 is about 405.5627942607.

The spelling of 66707447 in words is "sixty-six million, seven hundred seven thousand, four hundred forty-seven".