816993366 has 36 divisors (see below), whose sum is σ = 1901900988. Its totient is φ = 233286648.

The previous prime is 816993349. The next prime is 816993371. The reversal of 816993366 is 663399618.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 489265 + ... + 490931.

It is an arithmetic number, because the mean of its divisors is an integer number (52830583).

Almost surely, 2^816993366 is an apocalyptic number.

816993366 is an abundant number, since it is smaller than the sum of its proper divisors (1084907622).

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

816993366 is an equidigital number, since it uses as much as digits as its factorization.

816993366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353 (or 1679 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 51.

The square root of 816993366 is about 28583.0958085369. The cubic root of 816993366 is about 934.8447857349.

The spelling of 816993366 in words is "eight hundred sixteen million, nine hundred ninety-three thousand, three hundred sixty-six".