6666461 has 4 divisors (see below), whose sum is σ = 6675900. Its totient is φ = 6657024.

The previous prime is 6666449. The next prime is 6666467. The reversal of 6666461 is 1646666.

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 2785561 + 3880900 = 1669^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666461 - 2¹⁰ = 6665437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666467) 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, 3566 + ... + 5103.

It is an arithmetic number, because the mean of its divisors is an integer number (1668975).

Almost surely, 2^6666461 is an apocalyptic number.

It is an amenable number.

6666461 is a deficient number, since it is larger than the sum of its proper divisors (9439).

6666461 is an equidigital number, since it uses as much as digits as its factorization.

6666461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9438.

The product of its digits is 31104, while the sum is 35.

The square root of 6666461 is about 2581.9490699857. The cubic root of 6666461 is about 188.2052703589.

The spelling of 6666461 in words is "six million, six hundred sixty-six thousand, four hundred sixty-one".