811744342861 has 4 divisors (see below), whose sum is σ = 812825228224. Its totient is φ = 810663457500.

The previous prime is 811744342847. The next prime is 811744342867. The reversal of 811744342861 is 168243447118.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 811744342861 - 2⁷ = 811744342733 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 (811744342867) 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, 540441555 + ... + 540443056.

It is an arithmetic number, because the mean of its divisors is an integer number (203206307056).

Almost surely, 2^811744342861 is an apocalyptic number.

It is an amenable number.

811744342861 is a deficient number, since it is larger than the sum of its proper divisors (1080885363).

811744342861 is a wasteful number, since it uses less digits than its factorization.

811744342861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080885362.

The product of its digits is 1032192, while the sum is 49.

Adding to 811744342861 its reverse (168243447118), we get a palindrome (979987789979).

The spelling of 811744342861 in words is "eight hundred eleven billion, seven hundred forty-four million, three hundred forty-two thousand, eight hundred sixty-one".