6816559956 has 24 divisors (see below), whose sum is σ = 16596842304. Its totient is φ = 2173395840.

The previous prime is 6816559949. The next prime is 6816559957. The reversal of 6816559956 is 6599556186.

It is a self number, because there is not a number n which added to its sum of digits gives 6816559956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6816559957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12348565 + ... + 12349116.

It is an arithmetic number, because the mean of its divisors is an integer number (691535096).

Almost surely, 2^6816559956 is an apocalyptic number.

It is an amenable number.

6816559956 is an abundant number, since it is smaller than the sum of its proper divisors (9780282348).

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

6816559956 is a wasteful number, since it uses less digits than its factorization.

6816559956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24697711 (or 24697709 counting only the distinct ones).

The product of its digits is 17496000, while the sum is 60.

The square root of 6816559956 is about 82562.4609371596. The cubic root of 6816559956 is about 1896.0731413950.

The spelling of 6816559956 in words is "six billion, eight hundred sixteen million, five hundred fifty-nine thousand, nine hundred fifty-six".