66800263 has 2 divisors, whose sum is σ = 66800264. Its totient is φ = 66800262.

The previous prime is 66800249. The next prime is 66800287. The reversal of 66800263 is 36200866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66800263 - 2⁵ = 66800231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66800233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33400131 + 33400132.

It is an arithmetic number, because the mean of its divisors is an integer number (33400132).

Almost surely, 2^66800263 is an apocalyptic number.

66800263 is a deficient number, since it is larger than the sum of its proper divisors (1).

66800263 is an equidigital number, since it uses as much as digits as its factorization.

66800263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 66800263 is about 8173.1427859790. The cubic root of 66800263 is about 405.7508056094.

The spelling of 66800263 in words is "sixty-six million, eight hundred thousand, two hundred sixty-three".