810861331006 has 4 divisors (see below), whose sum is σ = 1216291996512. Its totient is φ = 405430665502.

The previous prime is 810861331003. The next prime is 810861331073. The reversal of 810861331006 is 600133168018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 600133168018 = 2 ⋅300066584009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810861331003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202715332750 + ... + 202715332753.

It is an arithmetic number, because the mean of its divisors is an integer number (304072999128).

Almost surely, 2^810861331006 is an apocalyptic number.

810861331006 is a deficient number, since it is larger than the sum of its proper divisors (405430665506).

810861331006 is a wasteful number, since it uses less digits than its factorization.

810861331006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405430665505.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 810861331006 in words is "eight hundred ten billion, eight hundred sixty-one million, three hundred thirty-one thousand, six".