812215537818 has 16 divisors (see below), whose sum is σ = 1627739495136. Its totient is φ = 270187109360.

The previous prime is 812215537813. The next prime is 812215537907. The reversal of 812215537818 is 818735512218.

812215537818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×812215537818² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (812215537813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137847621 + ... + 137853512.

It is an arithmetic number, because the mean of its divisors is an integer number (101733718446).

Almost surely, 2^812215537818 is an apocalyptic number.

812215537818 is an abundant number, since it is smaller than the sum of its proper divisors (815523957318).

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

812215537818 is a wasteful number, since it uses less digits than its factorization.

812215537818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275701629.

The product of its digits is 1075200, while the sum is 51.

The spelling of 812215537818 in words is "eight hundred twelve billion, two hundred fifteen million, five hundred thirty-seven thousand, eight hundred eighteen".