665610133333 has 4 divisors (see below), whose sum is σ = 678168815148. Its totient is φ = 653051451520.

The previous prime is 665610133319. The next prime is 665610133337. The reversal of 665610133333 is 333331016566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 313412987889 + 352197145444 = 559833^2 + 593462^2 .

It is a cyclic number.

It is not a de Polignac number, because 665610133333 - 2¹⁷ = 665610002261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665610133337) 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, 6279340828 + ... + 6279340933.

It is an arithmetic number, because the mean of its divisors is an integer number (169542203787).

Almost surely, 2^665610133333 is an apocalyptic number.

It is an amenable number.

665610133333 is a deficient number, since it is larger than the sum of its proper divisors (12558681815).

665610133333 is a wasteful number, since it uses less digits than its factorization.

665610133333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12558681814.

The product of its (nonzero) digits is 262440, while the sum is 40.

Adding to 665610133333 its reverse (333331016566), we get a palindrome (998941149899).

The spelling of 665610133333 in words is "six hundred sixty-five billion, six hundred ten million, one hundred thirty-three thousand, three hundred thirty-three".