66633563 has 2 divisors, whose sum is σ = 66633564. Its totient is φ = 66633562.

The previous prime is 66633547. The next prime is 66633587. The reversal of 66633563 is 36533666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66633563 - 2⁴ = 66633547 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66633163) 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, 33316781 + 33316782.

It is an arithmetic number, because the mean of its divisors is an integer number (33316782).

Almost surely, 2^66633563 is an apocalyptic number.

66633563 is a deficient number, since it is larger than the sum of its proper divisors (1).

66633563 is an equidigital number, since it uses as much as digits as its factorization.

66633563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 38.

The square root of 66633563 is about 8162.9383802648. The cubic root of 66633563 is about 405.4130075307.

The spelling of 66633563 in words is "sixty-six million, six hundred thirty-three thousand, five hundred sixty-three".