665834212 has 6 divisors (see below), whose sum is σ = 1165209878. Its totient is φ = 332917104.

The previous prime is 665834209. The next prime is 665834227. The reversal of 665834212 is 212438566.

It can be written as a sum of positive squares in only one way, i.e., 508682916 + 157151296 = 22554^2 + 12536^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83229273 + ... + 83229280.

Almost surely, 2^665834212 is an apocalyptic number.

It is an amenable number.

665834212 is a deficient number, since it is larger than the sum of its proper divisors (499375666).

665834212 is a wasteful number, since it uses less digits than its factorization.

665834212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166458557 (or 166458555 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 665834212 is about 25803.7635239513. The cubic root of 665834212 is about 873.2167052203.

The spelling of 665834212 in words is "six hundred sixty-five million, eight hundred thirty-four thousand, two hundred twelve".