6667261 has 2 divisors, whose sum is σ = 6667262. Its totient is φ = 6667260.

The previous prime is 6667259. The next prime is 6667273. The reversal of 6667261 is 1627666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3587236 + 3080025 = 1894^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 6667261 - 2¹ = 6667259 is a prime.

Together with 6667259, it forms a pair of twin primes.

6667261 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6667291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333630 + 3333631.

It is an arithmetic number, because the mean of its divisors is an integer number (3333631).

Almost surely, 2^6667261 is an apocalyptic number.

It is an amenable number.

6667261 is a deficient number, since it is larger than the sum of its proper divisors (1).

6667261 is an equidigital number, since it uses as much as digits as its factorization.

6667261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 6667261 is about 2582.1039870617. The cubic root of 6667261 is about 188.2127985008.

The spelling of 6667261 in words is "six million, six hundred sixty-seven thousand, two hundred sixty-one".