660565171 has 4 divisors (see below), whose sum is σ = 754931632. Its totient is φ = 566198712.

The previous prime is 660565151. The next prime is 660565193. The reversal of 660565171 is 171565066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660565171 - 2¹⁹ = 660040883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660565171.

It is not an unprimeable number, because it can be changed into a prime (660565151) 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 3 ways as a sum of consecutive naturals, for example, 47183220 + ... + 47183233.

It is an arithmetic number, because the mean of its divisors is an integer number (188732908).

Almost surely, 2^660565171 is an apocalyptic number.

660565171 is a deficient number, since it is larger than the sum of its proper divisors (94366461).

660565171 is an equidigital number, since it uses as much as digits as its factorization.

660565171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94366460.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 660565171 is about 25701.4624292082. The cubic root of 660565171 is about 870.9072189645.

The spelling of 660565171 in words is "six hundred sixty million, five hundred sixty-five thousand, one hundred seventy-one".