665636415233 has 8 divisors (see below), whose sum is σ = 706603308840. Its totient is φ = 624870833920.

The previous prime is 665636415221. The next prime is 665636415247. The reversal of 665636415233 is 332514636566.

It can be written as a sum of positive squares in 4 ways, for example, as 16633776784 + 649002638449 = 128972^2 + 805607^2 .

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 665636415233 - 2²⁰ = 665635366657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665636415253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50321258 + ... + 50334483.

It is an arithmetic number, because the mean of its divisors is an integer number (88325413605).

Almost surely, 2^665636415233 is an apocalyptic number.

It is an amenable number.

665636415233 is a deficient number, since it is larger than the sum of its proper divisors (40966893607).

665636415233 is a wasteful number, since it uses less digits than its factorization.

665636415233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100656147.

The product of its digits is 6998400, while the sum is 50.

The spelling of 665636415233 in words is "six hundred sixty-five billion, six hundred thirty-six million, four hundred fifteen thousand, two hundred thirty-three".