816231577812 has 24 divisors (see below), whose sum is σ = 2176617541056. Its totient is φ = 233209022208.

The previous prime is 816231577789. The next prime is 816231577829. The reversal of 816231577812 is 218775132618.

816231577812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4858521213 + ... + 4858521380.

It is an arithmetic number, because the mean of its divisors is an integer number (90692397544).

Almost surely, 2^816231577812 is an apocalyptic number.

It is an amenable number.

816231577812 is an abundant number, since it is smaller than the sum of its proper divisors (1360385963244).

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

816231577812 is a wasteful number, since it uses less digits than its factorization.

816231577812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9717042607 (or 9717042605 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 51.

The spelling of 816231577812 in words is "eight hundred sixteen billion, two hundred thirty-one million, five hundred seventy-seven thousand, eight hundred twelve".