66539867 has 2 divisors, whose sum is σ = 66539868. Its totient is φ = 66539866.

The previous prime is 66539839. The next prime is 66539899. The reversal of 66539867 is 76893566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66539867 - 2⁸ = 66539611 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66539807) 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, 33269933 + 33269934.

It is an arithmetic number, because the mean of its divisors is an integer number (33269934).

Almost surely, 2^66539867 is an apocalyptic number.

66539867 is a deficient number, since it is larger than the sum of its proper divisors (1).

66539867 is an equidigital number, since it uses as much as digits as its factorization.

66539867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 50.

The square root of 66539867 is about 8157.1972515074. The cubic root of 66539867 is about 405.2228961529. Note that the first 3 decimals are identical.

The spelling of 66539867 in words is "sixty-six million, five hundred thirty-nine thousand, eight hundred sixty-seven".