816615538404000 has 192 divisors, whose sum is σ = 2679104068647552. Its totient is φ = 217448997888000.

The previous prime is 816615538403989. The next prime is 816615538404019. The reversal of 816615538404000 is 404835516618.

It is a happy number.

816615538404000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 40949169 + ... + 57533168.

It is an arithmetic number, because the mean of its divisors is an integer number (13953667024206).

Almost surely, 2^{816615538404000} is an apocalyptic number.

816615538404000 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

816615538404000 is an abundant number, since it is smaller than the sum of its proper divisors (1862488530243552).

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

816615538404000 is a wasteful number, since it uses less digits than its factorization.

816615538404000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98483056 (or 98483038 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 816615538404000 in words is "eight hundred sixteen trillion, six hundred fifteen billion, five hundred thirty-eight million, four hundred four thousand".