66563111 has 4 divisors (see below), whose sum is σ = 68362152. Its totient is φ = 64764072.

The previous prime is 66563089. The next prime is 66563179. The reversal of 66563111 is 11136566.

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 66563111 - 2¹⁰ = 66562087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66563411) 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, 899465 + ... + 899538.

It is an arithmetic number, because the mean of its divisors is an integer number (17090538).

Almost surely, 2^66563111 is an apocalyptic number.

66563111 is a deficient number, since it is larger than the sum of its proper divisors (1799041).

66563111 is a wasteful number, since it uses less digits than its factorization.

66563111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799040.

The product of its digits is 3240, while the sum is 29.

The square root of 66563111 is about 8158.6218811758. The cubic root of 66563111 is about 405.2700754099.

Adding to 66563111 its reverse (11136566), we get a palindrome (77699677).

The spelling of 66563111 in words is "sixty-six million, five hundred sixty-three thousand, one hundred eleven".