6661065223 has 4 divisors (see below), whose sum is σ = 6683799528. Its totient is φ = 6638330920.

The previous prime is 6661065221. The next prime is 6661065227. The reversal of 6661065223 is 3225601666.

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 6661065223 - 2¹ = 6661065221 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 (6661065221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11366713 + ... + 11367298.

It is an arithmetic number, because the mean of its divisors is an integer number (1670949882).

Almost surely, 2^6661065223 is an apocalyptic number.

6661065223 is a deficient number, since it is larger than the sum of its proper divisors (22734305).

6661065223 is a wasteful number, since it uses less digits than its factorization.

6661065223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22734304.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 6661065223 is about 81615.3491875150. The cubic root of 6661065223 is about 1881.5447940322.

Adding to 6661065223 its reverse (3225601666), we get a palindrome (9886666889).

The spelling of 6661065223 in words is "six billion, six hundred sixty-one million, sixty-five thousand, two hundred twenty-three".