816600397944 has 128 divisors (see below), whose sum is σ = 2192203284480. Its totient is φ = 252879369600.

The previous prime is 816600397937. The next prime is 816600397961. The reversal of 816600397944 is 449793006618.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3278529 + ... + 3518799.

It is an arithmetic number, because the mean of its divisors is an integer number (17126588160).

Almost surely, 2^816600397944 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 816600397944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096101642240).

816600397944 is an abundant number, since it is smaller than the sum of its proper divisors (1375602886536).

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

816600397944 is a wasteful number, since it uses less digits than its factorization.

816600397944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240481 (or 240477 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 57.

The spelling of 816600397944 in words is "eight hundred sixteen billion, six hundred million, three hundred ninety-seven thousand, nine hundred forty-four".