811681972396 has 6 divisors (see below), whose sum is σ = 1420443451700. Its totient is φ = 405840986196.

The previous prime is 811681972393. The next prime is 811681972411. The reversal of 811681972396 is 693279186118.

It is not an unprimeable number, because it can be changed into a prime (811681972393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101460246546 + ... + 101460246553.

Almost surely, 2^811681972396 is an apocalyptic number.

It is an amenable number.

811681972396 is a deficient number, since it is larger than the sum of its proper divisors (608761479304).

811681972396 is a wasteful number, since it uses less digits than its factorization.

811681972396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202920493103 (or 202920493101 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 61.

The spelling of 811681972396 in words is "eight hundred eleven billion, six hundred eighty-one million, nine hundred seventy-two thousand, three hundred ninety-six".