812691868032 has 128 divisors (see below), whose sum is σ = 2616621667200. Its totient is φ = 246270251520.

The previous prime is 812691867959. The next prime is 812691868073. The reversal of 812691868032 is 230868196218.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 812691868032.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10650798 + ... + 10726829.

It is an arithmetic number, because the mean of its divisors is an integer number (20442356775).

Almost surely, 2^812691868032 is an apocalyptic number.

It is an amenable number.

812691868032 is an abundant number, since it is smaller than the sum of its proper divisors (1803929799168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812691868032 is a wasteful number, since it uses less digits than its factorization.

812691868032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21377661 (or 21377643 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

It can be divided in two parts, 81269186 and 8032, that added together give a palindrome (81277218).

The spelling of 812691868032 in words is "eight hundred twelve billion, six hundred ninety-one million, eight hundred sixty-eight thousand, thirty-two".