6816913409817 has 96 divisors (see below), whose sum is σ = 11657360332800. Its totient is φ = 3836342331360.

The previous prime is 6816913409797. The next prime is 6816913409843. The reversal of 6816913409817 is 7189043196186.

6816913409817 is a `hidden beast` number, since 6 + 81 + 69 + 13 + 409 + 81 + 7 = 666.

It is not a de Polignac number, because 6816913409817 - 2¹² = 6816913405721 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (6816913409017) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 207544198 + ... + 207577040.

It is an arithmetic number, because the mean of its divisors is an integer number (121430836800).

Almost surely, 2^{6816913409817} is an apocalyptic number.

It is an amenable number.

6816913409817 is a deficient number, since it is larger than the sum of its proper divisors (4840446922983).

6816913409817 is a wasteful number, since it uses less digits than its factorization.

6816913409817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33888 (or 33871 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 6816913409817 in words is "six trillion, eight hundred sixteen billion, nine hundred thirteen million, four hundred nine thousand, eight hundred seventeen".