865233133109 has 4 divisors (see below), whose sum is σ = 886336380300. Its totient is φ = 844129885920.

The previous prime is 865233133073. The next prime is 865233133229. The reversal of 865233133109 is 901331332568.

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 409772818225 + 455460314884 = 640135^2 + 674878^2 .

It is a cyclic number.

It is not a de Polignac number, because 865233133109 - 2³⁶ = 796513656373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 865233133109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865233133909) 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, 10551623534 + ... + 10551623615.

It is an arithmetic number, because the mean of its divisors is an integer number (221584095075).

Almost surely, 2^865233133109 is an apocalyptic number.

It is an amenable number.

865233133109 is a deficient number, since it is larger than the sum of its proper divisors (21103247191).

865233133109 is a wasteful number, since it uses less digits than its factorization.

865233133109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21103247190.

The product of its (nonzero) digits is 349920, while the sum is 44.

The spelling of 865233133109 in words is "eight hundred sixty-five billion, two hundred thirty-three million, one hundred thirty-three thousand, one hundred nine".