66432563 has 2 divisors, whose sum is σ = 66432564. Its totient is φ = 66432562.

The previous prime is 66432559. The next prime is 66432571. The reversal of 66432563 is 36523466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66432563 - 2² = 66432559 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66402563) 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, 33216281 + 33216282.

It is an arithmetic number, because the mean of its divisors is an integer number (33216282).

Almost surely, 2^66432563 is an apocalyptic number.

66432563 is a deficient number, since it is larger than the sum of its proper divisors (1).

66432563 is an equidigital number, since it uses as much as digits as its factorization.

66432563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 35.

The square root of 66432563 is about 8150.6173385824. The cubic root of 66432563 is about 405.0049544687.

The spelling of 66432563 in words is "sixty-six million, four hundred thirty-two thousand, five hundred sixty-three".