6666001 has 2 divisors, whose sum is σ = 6666002. Its totient is φ = 6666000.

The previous prime is 6665987. The next prime is 6666029. The reversal of 6666001 is 1006666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4309776 + 2356225 = 2076^2 + 1535^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666001 - 2⁷ = 6665873 is a prime.

6666001 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6666061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333000 + 3333001.

It is an arithmetic number, because the mean of its divisors is an integer number (3333001).

Almost surely, 2^6666001 is an apocalyptic number.

It is an amenable number.

6666001 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666001 is an equidigital number, since it uses as much as digits as its factorization.

6666001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 6666001 is about 2581.8599884579. The cubic root of 6666001 is about 188.2009414045.

The spelling of 6666001 in words is "six million, six hundred sixty-six thousand, one".