665333665 has 8 divisors (see below), whose sum is σ = 800299368. Its totient is φ = 531000960.

The previous prime is 665333653. The next prime is 665333677. The reversal of 665333665 is 566333566.

665333665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (665333653) and next prime (665333677).

It can be written as a sum of positive squares in 4 ways, for example, as 108326464 + 557007201 = 10408^2 + 23601^2 .

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

It is not a de Polignac number, because 665333665 - 2²³ = 656945057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155932 + ... + 160141.

It is an arithmetic number, because the mean of its divisors is an integer number (100037421).

Almost surely, 2^665333665 is an apocalyptic number.

It is an amenable number.

665333665 is a deficient number, since it is larger than the sum of its proper divisors (134965703).

665333665 is a wasteful number, since it uses less digits than its factorization.

665333665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316499.

The product of its digits is 874800, while the sum is 43.

The square root of 665333665 is about 25794.0625919997. The cubic root of 665333665 is about 872.9978341321.

Subtracting from 665333665 its reverse (566333566), we obtain a palindrome (99000099).

The spelling of 665333665 in words is "six hundred sixty-five million, three hundred thirty-three thousand, six hundred sixty-five".