63666523 has 2 divisors, whose sum is σ = 63666524. Its totient is φ = 63666522.

The previous prime is 63666517. The next prime is 63666539. The reversal of 63666523 is 32566636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63666523 - 2²⁵ = 30112091 is a prime.

It is not a weakly prime, because it can be changed into another prime (63666593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31833261 + 31833262.

It is an arithmetic number, because the mean of its divisors is an integer number (31833262).

Almost surely, 2^63666523 is an apocalyptic number.

63666523 is a deficient number, since it is larger than the sum of its proper divisors (1).

63666523 is an equidigital number, since it uses as much as digits as its factorization.

63666523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 37.

The square root of 63666523 is about 7979.1304664105. The cubic root of 63666523 is about 399.3040460726.

The spelling of 63666523 in words is "sixty-three million, six hundred sixty-six thousand, five hundred twenty-three".