66563867 has 2 divisors, whose sum is σ = 66563868. Its totient is φ = 66563866.

The previous prime is 66563807. The next prime is 66563873. The reversal of 66563867 is 76836566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66563867 - 2⁸ = 66563611 is a prime.

It is not a weakly prime, because it can be changed into another prime (66563807) 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, 33281933 + 33281934.

It is an arithmetic number, because the mean of its divisors is an integer number (33281934).

Almost surely, 2^66563867 is an apocalyptic number.

66563867 is a deficient number, since it is larger than the sum of its proper divisors (1).

66563867 is an equidigital number, since it uses as much as digits as its factorization.

66563867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 47.

The square root of 66563867 is about 8158.6682123984. The cubic root of 66563867 is about 405.2716097082.

The spelling of 66563867 in words is "sixty-six million, five hundred sixty-three thousand, eight hundred sixty-seven".