6666641 has 4 divisors (see below), whose sum is σ = 6829284. Its totient is φ = 6504000.

The previous prime is 6666617. The next prime is 6666679. The reversal of 6666641 is 1466666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1466666 = 2 ⋅733333.

It can be written as a sum of positive squares in 2 ways, for example, as 3225616 + 3441025 = 1796^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666641 - 2⁶ = 6666577 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (6666241) 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, 81260 + ... + 81341.

It is an arithmetic number, because the mean of its divisors is an integer number (1707321).

Almost surely, 2^6666641 is an apocalyptic number.

It is an amenable number.

6666641 is a deficient number, since it is larger than the sum of its proper divisors (162643).

6666641 is a wasteful number, since it uses less digits than its factorization.

6666641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162642.

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

The square root of 6666641 is about 2581.9839271382. The cubic root of 6666641 is about 188.2069642433.

The spelling of 6666641 in words is "six million, six hundred sixty-six thousand, six hundred forty-one".