665144885 has 8 divisors (see below), whose sum is σ = 803916960. Its totient is φ = 528287184.

The previous prime is 665144881. The next prime is 665144903. The reversal of 665144885 is 588441566.

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

It is a cyclic number.

It is not a de Polignac number, because 665144885 - 2² = 665144881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665144881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477827 + ... + 479216.

It is an arithmetic number, because the mean of its divisors is an integer number (100489620).

Almost surely, 2^665144885 is an apocalyptic number.

It is an amenable number.

665144885 is a deficient number, since it is larger than the sum of its proper divisors (138772075).

665144885 is a wasteful number, since it uses less digits than its factorization.

665144885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957187.

The product of its digits is 921600, while the sum is 47.

The square root of 665144885 is about 25790.4029631179. The cubic root of 665144885 is about 872.9152589625.

The spelling of 665144885 in words is "six hundred sixty-five million, one hundred forty-four thousand, eight hundred eighty-five".