66802471 has 2 divisors, whose sum is σ = 66802472. Its totient is φ = 66802470.

The previous prime is 66802459. The next prime is 66802481. The reversal of 66802471 is 17420866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66802471 - 2⁷ = 66802343 is a prime.

It is a super-3 number, since 3×66802471³ (a number of 24 digits) contains 333 as substring.

It is equal to p_3940828 and since 66802471 and 3940828 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 (66802451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33401235 + 33401236.

It is an arithmetic number, because the mean of its divisors is an integer number (33401236).

Almost surely, 2^66802471 is an apocalyptic number.

66802471 is a deficient number, since it is larger than the sum of its proper divisors (1).

66802471 is an equidigital number, since it uses as much as digits as its factorization.

66802471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66802471 is about 8173.2778614213. The cubic root of 66802471 is about 405.7552760904.

The spelling of 66802471 in words is "sixty-six million, eight hundred two thousand, four hundred seventy-one".