66456563 has 4 divisors (see below), whose sum is σ = 67448520. Its totient is φ = 65464608.

The previous prime is 66456521. The next prime is 66456581. The reversal of 66456563 is 36565466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66456563 - 2⁸ = 66456307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66456563.

It is not an unprimeable number, because it can be changed into a prime (66456263) 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 in 3 ways as a sum of consecutive naturals, for example, 495878 + ... + 496011.

It is an arithmetic number, because the mean of its divisors is an integer number (16862130).

Almost surely, 2^66456563 is an apocalyptic number.

66456563 is a deficient number, since it is larger than the sum of its proper divisors (991957).

66456563 is an equidigital number, since it uses as much as digits as its factorization.

66456563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991956.

The product of its digits is 388800, while the sum is 41.

The square root of 66456563 is about 8152.0894867512. The cubic root of 66456563 is about 405.0537204562.

The spelling of 66456563 in words is "sixty-six million, four hundred fifty-six thousand, five hundred sixty-three".