16395215856 has 80 divisors (see below), whose sum is σ = 44285856000. Its totient is φ = 5216808960.

The previous prime is 16395215849. The next prime is 16395215857. The reversal of 16395215856 is 65851259361.

It is a junction number, because it is equal to n+sod(n) for n = 16395215799 and 16395215808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16395215857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 536016 + ... + 565776.

It is an arithmetic number, because the mean of its divisors is an integer number (553573200).

Almost surely, 2^16395215856 is an apocalyptic number.

16395215856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16395215856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22142928000).

16395215856 is an abundant number, since it is smaller than the sum of its proper divisors (27890640144).

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

16395215856 is a wasteful number, since it uses less digits than its factorization.

16395215856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30294 (or 30288 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 51.

The spelling of 16395215856 in words is "sixteen billion, three hundred ninety-five million, two hundred fifteen thousand, eight hundred fifty-six".