818644641312 has 96 divisors (see below), whose sum is σ = 2309311311552. Its totient is φ = 252996378624.

The previous prime is 818644641289. The next prime is 818644641313. The reversal of 818644641312 is 213146446818.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (818644641313) 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 in 15 ways as a sum of consecutive naturals, for example, 3634093 + ... + 3852780.

It is an arithmetic number, because the mean of its divisors is an integer number (24055326162).

Almost surely, 2^818644641312 is an apocalyptic number.

It is an amenable number.

818644641312 is an abundant number, since it is smaller than the sum of its proper divisors (1490666670240).

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

818644641312 is a wasteful number, since it uses less digits than its factorization.

818644641312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7486970 (or 7486962 counting only the distinct ones).

The product of its digits is 884736, while the sum is 48.

The spelling of 818644641312 in words is "eight hundred eighteen billion, six hundred forty-four million, six hundred forty-one thousand, three hundred twelve".