813861829757 has 4 divisors (see below), whose sum is σ = 813868130076. Its totient is φ = 813855529440.

The previous prime is 813861829751. The next prime is 813861829787. The reversal of 813861829757 is 757928168318.

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 375590025316 + 438271804441 = 612854^2 + 662021^2 .

It is a cyclic number.

It is not a de Polignac number, because 813861829757 - 2¹⁸ = 813861567613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 813861829693 and 813861829702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813861829751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2952248 + ... + 3216129.

It is an arithmetic number, because the mean of its divisors is an integer number (203467032519).

Almost surely, 2^813861829757 is an apocalyptic number.

It is an amenable number.

813861829757 is a deficient number, since it is larger than the sum of its proper divisors (6300319).

813861829757 is a wasteful number, since it uses less digits than its factorization.

813861829757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6300318.

The product of its digits is 40642560, while the sum is 65.

The spelling of 813861829757 in words is "eight hundred thirteen billion, eight hundred sixty-one million, eight hundred twenty-nine thousand, seven hundred fifty-seven".