813815440810 has 8 divisors (see below), whose sum is σ = 1464867793476. Its totient is φ = 325526176320.

The previous prime is 813815440807. The next prime is 813815440817. The reversal of 813815440810 is 18044518318.

It can be written as a sum of positive squares in 2 ways, for example, as 680610150081 + 133205290729 = 824991^2 + 364973^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×813815440810² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (813815440817) 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 3 ways as a sum of consecutive naturals, for example, 40690772031 + ... + 40690772050.

Almost surely, 2^813815440810 is an apocalyptic number.

813815440810 is a deficient number, since it is larger than the sum of its proper divisors (651052352666).

813815440810 is a wasteful number, since it uses less digits than its factorization.

813815440810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81381544088.

The product of its (nonzero) digits is 122880, while the sum is 43.

The spelling of 813815440810 in words is "eight hundred thirteen billion, eight hundred fifteen million, four hundred forty thousand, eight hundred ten".