812538272765 has 4 divisors (see below), whose sum is σ = 975045927324. Its totient is φ = 650030618208.

The previous prime is 812538272723. The next prime is 812538272797. The reversal of 812538272765 is 567272835218.

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 588735478681 + 223802794084 = 767291^2 + 473078^2 .

It is a cyclic number.

It is not a de Polignac number, because 812538272765 - 2¹² = 812538268669 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 812538272765.

It is a congruent number.

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, 81253827272 + ... + 81253827281.

It is an arithmetic number, because the mean of its divisors is an integer number (243761481831).

Almost surely, 2^812538272765 is an apocalyptic number.

It is an amenable number.

812538272765 is a deficient number, since it is larger than the sum of its proper divisors (162507654559).

812538272765 is a wasteful number, since it uses less digits than its factorization.

812538272765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162507654558.

The product of its digits is 11289600, while the sum is 56.

The spelling of 812538272765 in words is "eight hundred twelve billion, five hundred thirty-eight million, two hundred seventy-two thousand, seven hundred sixty-five".