6666673261 has 2 divisors, whose sum is σ = 6666673262. Its totient is φ = 6666673260.

The previous prime is 6666673253. The next prime is 6666673289. The reversal of 6666673261 is 1623766666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5292562500 + 1374110761 = 72750^2 + 37069^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666673261 - 2³ = 6666673253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666673231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333336630 + 3333336631.

It is an arithmetic number, because the mean of its divisors is an integer number (3333336631).

Almost surely, 2^6666673261 is an apocalyptic number.

It is an amenable number.

6666673261 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666673261 is an equidigital number, since it uses as much as digits as its factorization.

6666673261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 49.

The square root of 6666673261 is about 81649.6984746423. The cubic root of 6666673261 is about 1882.0726783124.

The spelling of 6666673261 in words is "six billion, six hundred sixty-six million, six hundred seventy-three thousand, two hundred sixty-one".