6661816833 has 8 divisors (see below), whose sum is σ = 10151339968. Its totient is φ = 3806752464.

The previous prime is 6661816781. The next prime is 6661816849. The reversal of 6661816833 is 3386181666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6661816833 - 2¹⁴ = 6661800449 is a prime.

It is a super-3 number, since 3×6661816833³ (a number of 30 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6661816033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158614666 + ... + 158614707.

It is an arithmetic number, because the mean of its divisors is an integer number (1268917496).

Almost surely, 2^6661816833 is an apocalyptic number.

It is an amenable number.

6661816833 is a deficient number, since it is larger than the sum of its proper divisors (3489523135).

6661816833 is a wasteful number, since it uses less digits than its factorization.

6661816833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317229383.

The product of its digits is 746496, while the sum is 48.

The square root of 6661816833 is about 81619.9536449268. The cubic root of 6661816833 is about 1881.6155602259.

The spelling of 6661816833 in words is "six billion, six hundred sixty-one million, eight hundred sixteen thousand, eight hundred thirty-three".