66500263 has 2 divisors, whose sum is σ = 66500264. Its totient is φ = 66500262.

The previous prime is 66500207. The next prime is 66500281. The reversal of 66500263 is 36200566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66500263 - 2²⁵ = 32945831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66500663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250131 + 33250132.

It is an arithmetic number, because the mean of its divisors is an integer number (33250132).

Almost surely, 2^66500263 is an apocalyptic number.

66500263 is a deficient number, since it is larger than the sum of its proper divisors (1).

66500263 is an equidigital number, since it uses as much as digits as its factorization.

66500263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 66500263 is about 8154.7693406987. The cubic root of 66500263 is about 405.1424850484.

The spelling of 66500263 in words is "sixty-six million, five hundred thousand, two hundred sixty-three".