66445487 has 2 divisors, whose sum is σ = 66445488. Its totient is φ = 66445486.

The previous prime is 66445447. The next prime is 66445499. The reversal of 66445487 is 78454466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66445487 - 2²² = 62251183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66445417) 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, 33222743 + 33222744.

It is an arithmetic number, because the mean of its divisors is an integer number (33222744).

Almost surely, 2^66445487 is an apocalyptic number.

66445487 is a deficient number, since it is larger than the sum of its proper divisors (1).

66445487 is an equidigital number, since it uses as much as digits as its factorization.

66445487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 44.

The square root of 66445487 is about 8151.4101234081. The cubic root of 66445487 is about 405.0312164121.

The spelling of 66445487 in words is "sixty-six million, four hundred forty-five thousand, four hundred eighty-seven".