665353666 has 8 divisors (see below), whose sum is σ = 1050558480. Its totient is φ = 315167508.

The previous prime is 665353627. The next prime is 665353669. The reversal of 665353666 is 666353566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (665353669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8754616 + ... + 8754691.

It is an arithmetic number, because the mean of its divisors is an integer number (131319810).

Almost surely, 2^665353666 is an apocalyptic number.

665353666 is a deficient number, since it is larger than the sum of its proper divisors (385204814).

665353666 is a wasteful number, since it uses less digits than its factorization.

665353666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17509328.

The product of its digits is 1749600, while the sum is 46.

The square root of 665353666 is about 25794.4502945886. The cubic root of 665353666 is about 873.0065819507.

The spelling of 665353666 in words is "six hundred sixty-five million, three hundred fifty-three thousand, six hundred sixty-six".