665016171000066 has 40 divisors (see below), whose sum is σ = 1490136597159804. Its totient is φ = 221670901199520.

The previous prime is 665016171000061. The next prime is 665016171000067. The reversal of 665016171000066 is 660000171610566.

665016171000066 is a `hidden beast` number, since 66 + 501 + 6 + 17 + 10 + 0 + 0 + 0 + 66 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 601985607806025 + 63030563194041 = 24535395^2 + 7939179^2 .

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 665016170999985 and 665016171000030.

It is not an unprimeable number, because it can be changed into a prime (665016171000061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20748556 + ... + 41958728.

Almost surely, 2^{665016171000066} is an apocalyptic number.

665016171000066 is an abundant number, since it is smaller than the sum of its proper divisors (825120426159738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665016171000066 is a wasteful number, since it uses less digits than its factorization.

665016171000066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21403728 (or 21403719 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The spelling of 665016171000066 in words is "six hundred sixty-five trillion, sixteen billion, one hundred seventy-one million, sixty-six", and thus it is an aban number.