812166978510 has 96 divisors (see below), whose sum is σ = 2126335536000. Its totient is φ = 215073344448.

The previous prime is 812166978509. The next prime is 812166978529. The reversal of 812166978510 is 15879661218.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11871181 + ... + 11939399.

It is an arithmetic number, because the mean of its divisors is an integer number (22149328500).

Almost surely, 2^812166978510 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812166978510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1063167768000).

812166978510 is an abundant number, since it is smaller than the sum of its proper divisors (1314168557490).

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

812166978510 is a wasteful number, since it uses less digits than its factorization.

812166978510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69150 (or 69147 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 812166978510 in words is "eight hundred twelve billion, one hundred sixty-six million, nine hundred seventy-eight thousand, five hundred ten".