665612533 has 8 divisors (see below), whose sum is σ = 673940960. Its totient is φ = 657324720.

The previous prime is 665612513. The next prime is 665612537. The reversal of 665612533 is 335216566.

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 665612533 - 2¹³ = 665604341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665612492 and 665612501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665612537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23518 + ... + 43408.

It is an arithmetic number, because the mean of its divisors is an integer number (84242620).

Almost surely, 2^665612533 is an apocalyptic number.

It is an amenable number.

665612533 is a deficient number, since it is larger than the sum of its proper divisors (8328427).

665612533 is a wasteful number, since it uses less digits than its factorization.

665612533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20307.

The product of its digits is 97200, while the sum is 37.

The square root of 665612533 is about 25799.4676883071. The cubic root of 665612533 is about 873.1197865535.

The spelling of 665612533 in words is "six hundred sixty-five million, six hundred twelve thousand, five hundred thirty-three".