816664687636 has 96 divisors (see below), whose sum is σ = 1714628095488. Its totient is φ = 332764692480.

The previous prime is 816664687627. The next prime is 816664687649. The reversal of 816664687636 is 636786466618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210424416 + ... + 210428296.

It is an arithmetic number, because the mean of its divisors is an integer number (17860709328).

Almost surely, 2^816664687636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816664687636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (857314047744).

816664687636 is an abundant number, since it is smaller than the sum of its proper divisors (897963407852).

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

816664687636 is a wasteful number, since it uses less digits than its factorization.

816664687636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5801 (or 5799 counting only the distinct ones).

The product of its digits is 250822656, while the sum is 67.

The spelling of 816664687636 in words is "eight hundred sixteen billion, six hundred sixty-four million, six hundred eighty-seven thousand, six hundred thirty-six".