815666976432 has 1200 divisors, whose sum is σ = 3140274009600.
Its totient is φ = 200373212160.
The previous prime is 815666976401. The next prime is 815666976433. The reversal of 815666976432 is 234679666518.
It is a Harshad number since it is a multiple of its sum of digits (63).
Its product of digits (78382080) is a multiple of the sum of its prime divisors (135).
It is a self number, because there is not a number n which added to its sum of digits gives 815666976432.
It is not an unprimeable number, because it can be changed into a prime (815666976433) by changing a digit.
It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 9164797444 + ... + 9164797532.
It is an arithmetic number, because the mean of its divisors is an integer number (2616895008).
Almost surely, 2815666976432 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 815666976432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1570137004800).
815666976432 is an abundant number, since it is smaller than the sum of its proper divisors (2324607033168).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
815666976432 is an equidigital number, since it uses as much as digits as its factorization.
815666976432 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 186 (or 135 counting only the distinct ones).
The product of its digits is 78382080, while the sum is 63.
The spelling of 815666976432 in words is "eight hundred fifteen billion, six hundred sixty-six million, nine hundred seventy-six thousand, four hundred thirty-two".