665084081 has 12 divisors (see below), whose sum is σ = 713399232. Its totient is φ = 619856448.

The previous prime is 665084059. The next prime is 665084099. The reversal of 665084081 is 180480566.

It is a de Polignac number, because none of the positive numbers 2^k-665084081 is a prime.

It is a super-2 number, since 2×665084081² = 884673669599229122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665089081) 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 11 ways as a sum of consecutive naturals, for example, 18596 + ... + 40938.

It is an arithmetic number, because the mean of its divisors is an integer number (59449936).

Almost surely, 2^665084081 is an apocalyptic number.

It is an amenable number.

665084081 is a deficient number, since it is larger than the sum of its proper divisors (48315151).

665084081 is a wasteful number, since it uses less digits than its factorization.

665084081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22480 (or 22463 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 665084081 is about 25789.2241255917. The cubic root of 665084081 is about 872.8886590652. Note that the first 3 decimals are identical.

The spelling of 665084081 in words is "six hundred sixty-five million, eighty-four thousand, eighty-one".