665665606015 has 16 divisors (see below), whose sum is σ = 824671892736. Its totient is φ = 515288102400.

The previous prime is 665665606007. The next prime is 665665606019. The reversal of 665665606015 is 510606566566.

It is not a de Polignac number, because 665665606015 - 2³ = 665665606007 is a prime.

It is a super-2 number, since 2×665665606015² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665665606019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 958935 + ... + 1500295.

It is an arithmetic number, because the mean of its divisors is an integer number (51541993296).

Almost surely, 2^665665606015 is an apocalyptic number.

665665606015 is a deficient number, since it is larger than the sum of its proper divisors (159006286721).

665665606015 is a wasteful number, since it uses less digits than its factorization.

665665606015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549330.

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 665665606015 in words is "six hundred sixty-five billion, six hundred sixty-five million, six hundred six thousand, fifteen".