16779819868 has 72 divisors (see below), whose sum is σ = 34583786496. Its totient is φ = 6975215520.

The previous prime is 16779819863. The next prime is 16779819871. The reversal of 16779819868 is 86891897761.

It is a junction number, because it is equal to n+sod(n) for n = 16779819797 and 16779819806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16779819863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22583505 + ... + 22584247.

It is an arithmetic number, because the mean of its divisors is an integer number (480330368).

Almost surely, 2^16779819868 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 16779819868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17291893248).

16779819868 is an abundant number, since it is smaller than the sum of its proper divisors (17803966628).

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

16779819868 is a wasteful number, since it uses less digits than its factorization.

16779819868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 930 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 70.

The spelling of 16779819868 in words is "sixteen billion, seven hundred seventy-nine million, eight hundred nineteen thousand, eight hundred sixty-eight".