66447287 has 2 divisors, whose sum is σ = 66447288. Its totient is φ = 66447286.

The previous prime is 66447281. The next prime is 66447307. The reversal of 66447287 is 78274466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66447287 - 2¹⁸ = 66185143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66447281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33223643 + 33223644.

It is an arithmetic number, because the mean of its divisors is an integer number (33223644).

Almost surely, 2^66447287 is an apocalyptic number.

66447287 is a deficient number, since it is larger than the sum of its proper divisors (1).

66447287 is an equidigital number, since it uses as much as digits as its factorization.

66447287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 44.

The square root of 66447287 is about 8151.5205330049. The cubic root of 66447287 is about 405.0348737942.

It can be divided in two parts, 6644 and 7287, that added together give a palindrome (13931).

The spelling of 66447287 in words is "sixty-six million, four hundred forty-seven thousand, two hundred eighty-seven".