9815216886 has 12 divisors (see below), whose sum is σ = 21266303292. Its totient is φ = 3271738956.

The previous prime is 9815216833. The next prime is 9815216933. The reversal of 9815216886 is 6886125189.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 272644896 + ... + 272644931.

It is an arithmetic number, because the mean of its divisors is an integer number (1772191941).

Almost surely, 2^9815216886 is an apocalyptic number.

9815216886 is an abundant number, since it is smaller than the sum of its proper divisors (11451086406).

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

9815216886 is a wasteful number, since it uses less digits than its factorization.

9815216886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545289835 (or 545289832 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The square root of 9815216886 is about 99071.7764350675. The cubic root of 9815216886 is about 2141.0819990609.

The spelling of 9815216886 in words is "nine billion, eight hundred fifteen million, two hundred sixteen thousand, eight hundred eighty-six".