665033666 has 24 divisors (see below), whose sum is σ = 1100066940. Its totient is φ = 301299680.

The previous prime is 665033647. The next prime is 665033689. The reversal of 665033666 is 666330566.

It can be written as a sum of positive squares in 2 ways, for example, as 606587641 + 58446025 = 24629^2 + 7645^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72380 + ... + 81048.

Almost surely, 2^665033666 is an apocalyptic number.

665033666 is a deficient number, since it is larger than the sum of its proper divisors (435033274).

665033666 is a wasteful number, since it uses less digits than its factorization.

665033666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010 (or 8999 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 41.

The square root of 665033666 is about 25788.2466639359. The cubic root of 665033666 is about 872.8666028095.

The spelling of 665033666 in words is "six hundred sixty-five million, thirty-three thousand, six hundred sixty-six".