6861664289 has 8 divisors (see below), whose sum is σ = 6977715840. Its totient is φ = 6746152000.

The previous prime is 6861664261. The next prime is 6861664297. The reversal of 6861664289 is 9824661686.

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

It is a cyclic number.

It is not a de Polignac number, because 6861664289 - 2²⁴ = 6844887073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6861664259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109112 + ... + 160089.

It is an arithmetic number, because the mean of its divisors is an integer number (872214480).

Almost surely, 2^6861664289 is an apocalyptic number.

It is an amenable number.

6861664289 is a deficient number, since it is larger than the sum of its proper divisors (116051551).

6861664289 is a wasteful number, since it uses less digits than its factorization.

6861664289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269631.

The product of its digits is 5971968, while the sum is 56.

The square root of 6861664289 is about 82835.1633607371. The cubic root of 6861664289 is about 1900.2459782184.

The spelling of 6861664289 in words is "six billion, eight hundred sixty-one million, six hundred sixty-four thousand, two hundred eighty-nine".