6666853261 has 4 divisors (see below), whose sum is σ = 6758180092. Its totient is φ = 6575526432.

The previous prime is 6666853253. The next prime is 6666853289. The reversal of 6666853261 is 1623586666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5045260900 + 1621592361 = 71030^2 + 40269^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666853261 - 2³ = 6666853253 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 (6666853201) 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, 45663306 + ... + 45663451.

It is an arithmetic number, because the mean of its divisors is an integer number (1689545023).

Almost surely, 2^6666853261 is an apocalyptic number.

It is an amenable number.

6666853261 is a deficient number, since it is larger than the sum of its proper divisors (91326831).

6666853261 is an equidigital number, since it uses as much as digits as its factorization.

6666853261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91326830.

The product of its digits is 1866240, while the sum is 49.

The square root of 6666853261 is about 81650.8007370412. The cubic root of 6666853261 is about 1882.0896167973.

The spelling of 6666853261 in words is "six billion, six hundred sixty-six million, eight hundred fifty-three thousand, two hundred sixty-one".