865123172553263 has 8 divisors (see below), whose sum is σ = 931824520993968. Its totient is φ = 798443740125504.

The previous prime is 865123172553221. The next prime is 865123172553323. The reversal of 865123172553263 is 362355271321568.

It is a happy number.

865123172553263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 865123172553263 - 2³⁴ = 865105992684079 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 (865123172553463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5478921245 + ... + 5479079142.

It is an arithmetic number, because the mean of its divisors is an integer number (116478065124246).

Almost surely, 2^{865123172553263} is an apocalyptic number.

865123172553263 is a deficient number, since it is larger than the sum of its proper divisors (66701348440705).

865123172553263 is a wasteful number, since it uses less digits than its factorization.

865123172553263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10958006473.

The product of its digits is 54432000, while the sum is 59.

The spelling of 865123172553263 in words is "eight hundred sixty-five trillion, one hundred twenty-three billion, one hundred seventy-two million, five hundred fifty-three thousand, two hundred sixty-three".