4066665 has 24 divisors (see below), whose sum is σ = 6876288. Its totient is φ = 2052000.

The previous prime is 4066661. The next prime is 4066669. The reversal of 4066665 is 5666604.

It is an interprime number because it is at equal distance from previous prime (4066661) and next prime (4066669).

It is not a de Polignac number, because 4066665 - 2² = 4066661 is a prime.

4066665 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4066661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5040 + ... + 5790.

It is an arithmetic number, because the mean of its divisors is an integer number (286512).

Almost surely, 2^4066665 is an apocalyptic number.

It is an amenable number.

4066665 is a deficient number, since it is larger than the sum of its proper divisors (2809623).

4066665 is a wasteful number, since it uses less digits than its factorization.

4066665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 778 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 4066665 is about 2016.5973817299. The cubic root of 4066665 is about 159.6171183453.

The spelling of 4066665 in words is "four million, sixty-six thousand, six hundred sixty-five".