8163779856 has 160 divisors (see below), whose sum is σ = 22562841600. Its totient is φ = 2536266240.

The previous prime is 8163779809. The next prime is 8163779861. The reversal of 8163779856 is 6589773618.

It is a self number, because there is not a number n which added to its sum of digits gives 8163779856.

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, 26249941 + ... + 26250251.

It is an arithmetic number, because the mean of its divisors is an integer number (141017760).

Almost surely, 2^8163779856 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 8163779856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11281420800).

8163779856 is an abundant number, since it is smaller than the sum of its proper divisors (14399061744).

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

8163779856 is a wasteful number, since it uses less digits than its factorization.

8163779856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717 (or 711 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 60.

The square root of 8163779856 is about 90353.6377574251. The cubic root of 8163779856 is about 2013.5562280698.

The spelling of 8163779856 in words is "eight billion, one hundred sixty-three million, seven hundred seventy-nine thousand, eight hundred fifty-six".