66512447 has 2 divisors, whose sum is σ = 66512448. Its totient is φ = 66512446.

The previous prime is 66512431. The next prime is 66512477. The reversal of 66512447 is 74421566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66512447 - 2⁴ = 66512431 is a prime.

It is a Chen prime.

It is equal to p_3924728 and since 66512447 and 3924728 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 (66512477) 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, 33256223 + 33256224.

It is an arithmetic number, because the mean of its divisors is an integer number (33256224).

Almost surely, 2^66512447 is an apocalyptic number.

66512447 is a deficient number, since it is larger than the sum of its proper divisors (1).

66512447 is an equidigital number, since it uses as much as digits as its factorization.

66512447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 35.

The square root of 66512447 is about 8155.5163539778. The cubic root of 66512447 is about 405.1672265776.

The spelling of 66512447 in words is "sixty-six million, five hundred twelve thousand, four hundred forty-seven".