665171120106 has 24 divisors (see below), whose sum is σ = 1441252150884. Its totient is φ = 221716313280.

The previous prime is 665171120069. The next prime is 665171120147. The reversal of 665171120106 is 601021171566.

It is a happy number.

665171120106 is a `hidden beast` number, since 6 + 6 + 517 + 1 + 120 + 10 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 656464550625 + 8706569481 = 810225^2 + 93309^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47115 + ... + 1154366.

Almost surely, 2^665171120106 is an apocalyptic number.

665171120106 is an abundant number, since it is smaller than the sum of its proper divisors (776081030778).

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

665171120106 is a wasteful number, since it uses less digits than its factorization.

665171120106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232246 (or 1232243 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 665171120106 in words is "six hundred sixty-five billion, one hundred seventy-one million, one hundred twenty thousand, one hundred six".