665664206 has 32 divisors (see below), whose sum is σ = 1124083008. Its totient is φ = 293962240.

The previous prime is 665664193. The next prime is 665664211. The reversal of 665664206 is 602466566.

It is a super-2 number, since 2×665664206² = 886217670299220872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33416 + ... + 49476.

It is an arithmetic number, because the mean of its divisors is an integer number (35127594).

Almost surely, 2^665664206 is an apocalyptic number.

665664206 is a deficient number, since it is larger than the sum of its proper divisors (458418802).

665664206 is a wasteful number, since it uses less digits than its factorization.

665664206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16156.

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 665664206 is about 25800.4691042624. The cubic root of 665664206 is about 873.1423800540.

The spelling of 665664206 in words is "six hundred sixty-five million, six hundred sixty-four thousand, two hundred six".