66800863 has 2 divisors, whose sum is σ = 66800864. Its totient is φ = 66800862.

The previous prime is 66800843. The next prime is 66800869. The reversal of 66800863 is 36800866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66800863 - 2¹⁷ = 66669791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66800869) 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, 33400431 + 33400432.

It is an arithmetic number, because the mean of its divisors is an integer number (33400432).

Almost surely, 2^66800863 is an apocalyptic number.

66800863 is a deficient number, since it is larger than the sum of its proper divisors (1).

66800863 is an equidigital number, since it uses as much as digits as its factorization.

66800863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 66800863 is about 8173.1794914831. The cubic root of 66800863 is about 405.7520204238.

The spelling of 66800863 in words is "sixty-six million, eight hundred thousand, eight hundred sixty-three".