666160205 has 4 divisors (see below), whose sum is σ = 799392252. Its totient is φ = 532928160.

The previous prime is 666160193. The next prime is 666160211. The reversal of 666160205 is 502061666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 297597001 + 368563204 = 17251^2 + 19198^2 .

It is not a de Polignac number, because 666160205 - 2¹⁰ = 666159181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66616016 + ... + 66616025.

It is an arithmetic number, because the mean of its divisors is an integer number (199848063).

Almost surely, 2^666160205 is an apocalyptic number.

It is an amenable number.

666160205 is a deficient number, since it is larger than the sum of its proper divisors (133232047).

666160205 is a wasteful number, since it uses less digits than its factorization.

666160205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133232046.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 666160205 is about 25810.0795233180. The cubic root of 666160205 is about 873.3591911845.

It can be divided in two parts, 6661 and 60205, that added together give a palindrome (66866).

The spelling of 666160205 in words is "six hundred sixty-six million, one hundred sixty thousand, two hundred five".