6666261 has 32 divisors (see below), whose sum is σ = 10948608. Its totient is φ = 3521280.

The previous prime is 6666241. The next prime is 6666269. The reversal of 6666261 is 1626666.

It is not a de Polignac number, because 6666261 - 2⁵ = 6666229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666269) 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 31 ways as a sum of consecutive naturals, for example, 25216 + ... + 25478.

It is an arithmetic number, because the mean of its divisors is an integer number (342144).

Almost surely, 2^6666261 is an apocalyptic number.

6666261 is the 1491-st octagonal number.

It is an amenable number.

6666261 is a deficient number, since it is larger than the sum of its proper divisors (4282347).

6666261 is a wasteful number, since it uses less digits than its factorization.

6666261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361.

The product of its digits is 15552, while the sum is 33.

The square root of 6666261 is about 2581.9103392643. The cubic root of 6666261 is about 188.2033882293.

The spelling of 6666261 in words is "six million, six hundred sixty-six thousand, two hundred sixty-one".