665006505 has 16 divisors (see below), whose sum is σ = 1064344320. Its totient is φ = 354558848.

The previous prime is 665006501. The next prime is 665006543. The reversal of 665006505 is 505600566.

665006505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 665006505 - 2² = 665006501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665006501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69661 + ... + 78629.

It is an arithmetic number, because the mean of its divisors is an integer number (66521520).

Almost surely, 2^665006505 is an apocalyptic number.

It is an amenable number.

665006505 is a deficient number, since it is larger than the sum of its proper divisors (399337815).

665006505 is a wasteful number, since it uses less digits than its factorization.

665006505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13920.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 665006505 is about 25787.7200426870. The cubic root of 665006505 is about 872.8547195752.

The spelling of 665006505 in words is "six hundred sixty-five million, six thousand, five hundred five".