13449863856 has 240 divisors, whose sum is σ = 42199799040. Its totient is φ = 3639052800.

The previous prime is 13449863851. The next prime is 13449863857. The reversal of 13449863856 is 65836894431.

It is a junction number, because it is equal to n+sod(n) for n = 13449863796 and 13449863805.

It is not an unprimeable number, because it can be changed into a prime (13449863851) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6595285 + ... + 6597323.

It is an arithmetic number, because the mean of its divisors is an integer number (175832496).

Almost surely, 2^13449863856 is an apocalyptic number.

13449863856 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 13449863856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21099899520).

13449863856 is an abundant number, since it is smaller than the sum of its proper divisors (28749935184).

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

13449863856 is a wasteful number, since it uses less digits than its factorization.

13449863856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2099 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 57.

The spelling of 13449863856 in words is "thirteen billion, four hundred forty-nine million, eight hundred sixty-three thousand, eight hundred fifty-six".