66217471 has 2 divisors, whose sum is σ = 66217472. Its totient is φ = 66217470.

The previous prime is 66217453. The next prime is 66217477. The reversal of 66217471 is 17471266.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66217471 - 2⁷ = 66217343 is a prime.

It is a super-3 number, since 3×66217471³ (a number of 24 digits) contains 333 as substring.

It is equal to p_3908275 and since 66217471 and 3908275 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66217477) 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, 33108735 + 33108736.

It is an arithmetic number, because the mean of its divisors is an integer number (33108736).

Almost surely, 2^66217471 is an apocalyptic number.

66217471 is a deficient number, since it is larger than the sum of its proper divisors (1).

66217471 is an equidigital number, since it uses as much as digits as its factorization.

66217471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 34.

The square root of 66217471 is about 8137.4118121182. The cubic root of 66217471 is about 404.5673803421.

The spelling of 66217471 in words is "sixty-six million, two hundred seventeen thousand, four hundred seventy-one".