666201005 has 16 divisors (see below), whose sum is σ = 845365248. Its totient is φ = 503184000.

The previous prime is 666201001. The next prime is 666201017. The reversal of 666201005 is 500102666.

It is not a de Polignac number, because 666201005 - 2² = 666201001 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 (666201001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46061 + ... + 58770.

It is an arithmetic number, because the mean of its divisors is an integer number (52835328).

Almost surely, 2^666201005 is an apocalyptic number.

It is an amenable number.

666201005 is a deficient number, since it is larger than the sum of its proper divisors (179164243).

666201005 is a wasteful number, since it uses less digits than its factorization.

666201005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104908.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 666201005 is about 25810.8699001022. The cubic root of 666201005 is about 873.3770208934.

The spelling of 666201005 in words is "six hundred sixty-six million, two hundred one thousand, five".