665566268 has 6 divisors (see below), whose sum is σ = 1164740976. Its totient is φ = 332783132.

The previous prime is 665566267. The next prime is 665566289. The reversal of 665566268 is 862665566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665566261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83195780 + ... + 83195787.

It is an arithmetic number, because the mean of its divisors is an integer number (194123496).

Almost surely, 2^665566268 is an apocalyptic number.

It is an amenable number.

665566268 is a deficient number, since it is larger than the sum of its proper divisors (499174708).

665566268 is a wasteful number, since it uses less digits than its factorization.

665566268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166391571 (or 166391569 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 50.

The square root of 665566268 is about 25798.5710456994. The cubic root of 665566268 is about 873.0995566545.

The spelling of 665566268 in words is "six hundred sixty-five million, five hundred sixty-six thousand, two hundred sixty-eight".