4005205665 has 8 divisors (see below), whose sum is σ = 6408329088. Its totient is φ = 2136109680.

The previous prime is 4005205597. The next prime is 4005205667. The reversal of 4005205665 is 5665025004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4005205665 - 2⁸ = 4005205409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4005205667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133506841 + ... + 133506870.

It is an arithmetic number, because the mean of its divisors is an integer number (801041136).

Almost surely, 2^4005205665 is an apocalyptic number.

It is an amenable number.

4005205665 is a deficient number, since it is larger than the sum of its proper divisors (2403123423).

4005205665 is a wasteful number, since it uses less digits than its factorization.

4005205665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267013719.

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 4005205665 is about 63286.6942176632. The cubic root of 4005205665 is about 1588.0893766303.

The spelling of 4005205665 in words is "four billion, five million, two hundred five thousand, six hundred sixty-five".