6815123555812 has 144 divisors (see below), whose sum is σ = 14458829749056. Its totient is φ = 2790508089600.

The previous prime is 6815123555803. The next prime is 6815123555833. The reversal of 6815123555812 is 2185553215186.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 6815123555812.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 321139362 + ... + 321160582.

It is an arithmetic number, because the mean of its divisors is an integer number (100408539924).

Almost surely, 2^{6815123555812} is an apocalyptic number.

It is an amenable number.

6815123555812 is an abundant number, since it is smaller than the sum of its proper divisors (7643706193244).

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

6815123555812 is a wasteful number, since it uses less digits than its factorization.

6815123555812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22490 (or 22477 counting only the distinct ones).

The product of its digits is 2880000, while the sum is 52.

It can be divided in two parts, 681512 and 3555812, that added together give a palindrome (4237324).

The spelling of 6815123555812 in words is "six trillion, eight hundred fifteen billion, one hundred twenty-three million, five hundred fifty-five thousand, eight hundred twelve".