813175126216861 has 12 divisors (see below), whose sum is σ = 908710284444732. Its totient is φ = 725060174454144.

The previous prime is 813175126216837. The next prime is 813175126216883. The reversal of 813175126216861 is 168612621571318.

It can be written as a sum of positive squares in 2 ways, for example, as 300703552729636 + 512471573487225 = 17340806^2 + 22637835^2 .

It is not a de Polignac number, because 813175126216861 - 2²⁷ = 813174991999133 is a prime.

It is a super-2 number, since 2×813175126216861² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 813175126216796 and 813175126216805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813175126216801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66251837290 + ... + 66251849563.

It is an arithmetic number, because the mean of its divisors is an integer number (75725857037061).

Almost surely, 2^{813175126216861} is an apocalyptic number.

It is an amenable number.

813175126216861 is a deficient number, since it is larger than the sum of its proper divisors (95535158227871).

813175126216861 is a wasteful number, since it uses less digits than its factorization.

813175126216861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132503686908 (or 132503686889 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 58.

The spelling of 813175126216861 in words is "eight hundred thirteen trillion, one hundred seventy-five billion, one hundred twenty-six million, two hundred sixteen thousand, eight hundred sixty-one".