66824117 has 2 divisors, whose sum is σ = 66824118. Its totient is φ = 66824116.

The previous prime is 66824099. The next prime is 66824129. The reversal of 66824117 is 71142866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64866916 + 1957201 = 8054^2 + 1399^2 .

It is a cyclic number.

It is not a de Polignac number, because 66824117 - 2¹⁰ = 66823093 is a prime.

It is a super-2 number, since 2×66824117² = 8930925225659378, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66824617) 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, 33412058 + 33412059.

It is an arithmetic number, because the mean of its divisors is an integer number (33412059).

Almost surely, 2^66824117 is an apocalyptic number.

It is an amenable number.

66824117 is a deficient number, since it is larger than the sum of its proper divisors (1).

66824117 is an equidigital number, since it uses as much as digits as its factorization.

66824117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 66824117 is about 8174.6019474957. The cubic root of 66824117 is about 405.7990969755.

The spelling of 66824117 in words is "sixty-six million, eight hundred twenty-four thousand, one hundred seventeen".