813444678461 has 4 divisors (see below), whose sum is σ = 821830706172. Its totient is φ = 805058650752.

The previous prime is 813444678457. The next prime is 813444678467. The reversal of 813444678461 is 164876444318.

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 279111456100 + 534333222361 = 528310^2 + 730981^2 .

It is a cyclic number.

It is not a de Polignac number, because 813444678461 - 2² = 813444678457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 813444678397 and 813444678406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813444678467) 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, 4193013710 + ... + 4193013903.

It is an arithmetic number, because the mean of its divisors is an integer number (205457676543).

Almost surely, 2^813444678461 is an apocalyptic number.

It is an amenable number.

813444678461 is a deficient number, since it is larger than the sum of its proper divisors (8386027711).

813444678461 is an equidigital number, since it uses as much as digits as its factorization.

813444678461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8386027710.

The product of its digits is 12386304, while the sum is 56.

The spelling of 813444678461 in words is "eight hundred thirteen billion, four hundred forty-four million, six hundred seventy-eight thousand, four hundred sixty-one".