665131535345 has 4 divisors (see below), whose sum is σ = 798157842420. Its totient is φ = 532105228272.

The previous prime is 665131535329. The next prime is 665131535389. The reversal of 665131535345 is 543535131566.

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 270886939024 + 394244596321 = 520468^2 + 627889^2 .

It is a cyclic number.

It is not a de Polignac number, because 665131535345 - 2⁴ = 665131535329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665131535345.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66513153530 + ... + 66513153539.

It is an arithmetic number, because the mean of its divisors is an integer number (199539460605).

Almost surely, 2^665131535345 is an apocalyptic number.

It is an amenable number.

665131535345 is a deficient number, since it is larger than the sum of its proper divisors (133026307075).

665131535345 is a wasteful number, since it uses less digits than its factorization.

665131535345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133026307074.

The product of its digits is 2430000, while the sum is 47.

The spelling of 665131535345 in words is "six hundred sixty-five billion, one hundred thirty-one million, five hundred thirty-five thousand, three hundred forty-five".