66559417 has 2 divisors, whose sum is σ = 66559418. Its totient is φ = 66559416.

The previous prime is 66559393. The next prime is 66559453. The reversal of 66559417 is 71495566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49716601 + 16842816 = 7051^2 + 4104^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66559417 is a prime.

It is not a weakly prime, because it can be changed into another prime (66559117) 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, 33279708 + 33279709.

It is an arithmetic number, because the mean of its divisors is an integer number (33279709).

Almost surely, 2^66559417 is an apocalyptic number.

It is an amenable number.

66559417 is a deficient number, since it is larger than the sum of its proper divisors (1).

66559417 is an equidigital number, since it uses as much as digits as its factorization.

66559417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 43.

The square root of 66559417 is about 8158.3954917618. The cubic root of 66559417 is about 405.2625782876.

The spelling of 66559417 in words is "sixty-six million, five hundred fifty-nine thousand, four hundred seventeen".