4001666305 has 16 divisors (see below), whose sum is σ = 5910153984. Its totient is φ = 2532922560.

The previous prime is 4001666303. The next prime is 4001666309. The reversal of 4001666305 is 5036661004.

It is not a de Polignac number, because 4001666305 - 2¹ = 4001666303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4001666303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4396981 + ... + 4397890.

It is an arithmetic number, because the mean of its divisors is an integer number (369384624).

Almost surely, 2^4001666305 is an apocalyptic number.

It is an amenable number.

4001666305 is a deficient number, since it is larger than the sum of its proper divisors (1908487679).

4001666305 is a wasteful number, since it uses less digits than its factorization.

4001666305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8794896.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 4001666305 is about 63258.7251294238. The cubic root of 4001666305 is about 1587.6214458932.

The spelling of 4001666305 in words is "four billion, one million, six hundred sixty-six thousand, three hundred five".