665017836485 has 4 divisors (see below), whose sum is σ = 798021403788. Its totient is φ = 532014269184.

The previous prime is 665017836481. The next prime is 665017836499. The reversal of 665017836485 is 584638710566.

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 206917633924 + 458100202561 = 454882^2 + 676831^2 .

It is a cyclic number.

It is not a de Polignac number, because 665017836485 - 2² = 665017836481 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 (665017836481) 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, 66501783644 + ... + 66501783653.

It is an arithmetic number, because the mean of its divisors is an integer number (199505350947).

Almost surely, 2^665017836485 is an apocalyptic number.

It is an amenable number.

665017836485 is a deficient number, since it is larger than the sum of its proper divisors (133003567303).

665017836485 is a wasteful number, since it uses less digits than its factorization.

665017836485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133003567302.

The product of its (nonzero) digits is 29030400, while the sum is 59.

The spelling of 665017836485 in words is "six hundred sixty-five billion, seventeen million, eight hundred thirty-six thousand, four hundred eighty-five".