666550515016 has 16 divisors (see below), whose sum is σ = 1250745829740. Its totient is φ = 333018293760.

The previous prime is 666550515011. The next prime is 666550515019. The reversal of 666550515016 is 610515055666.

It can be written as a sum of positive squares in 2 ways, for example, as 610357812516 + 56192702500 = 781254^2 + 237050^2 .

It is not an unprimeable number, because it can be changed into a prime (666550515011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32109445 + ... + 32130196.

Almost surely, 2^666550515016 is an apocalyptic number.

It is an amenable number.

666550515016 is a deficient number, since it is larger than the sum of its proper divisors (584195314724).

666550515016 is a wasteful number, since it uses less digits than its factorization.

666550515016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64240944 (or 64240940 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 666550515016 in words is "six hundred sixty-six billion, five hundred fifty million, five hundred fifteen thousand, sixteen".