66710563 has 2 divisors, whose sum is σ = 66710564. Its totient is φ = 66710562.

The previous prime is 66710551. The next prime is 66710569. The reversal of 66710563 is 36501766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66710563 - 2²⁵ = 33156131 is a prime.

It is not a weakly prime, because it can be changed into another prime (66710569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33355281 + 33355282.

It is an arithmetic number, because the mean of its divisors is an integer number (33355282).

Almost surely, 2^66710563 is an apocalyptic number.

66710563 is a deficient number, since it is larger than the sum of its proper divisors (1).

66710563 is an equidigital number, since it uses as much as digits as its factorization.

66710563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66710563 is about 8167.6534573891. The cubic root of 66710563 is about 405.5691089679.

The spelling of 66710563 in words is "sixty-six million, seven hundred ten thousand, five hundred sixty-three".