13313815856 has 90 divisors (see below), whose sum is σ = 29069277468. Its totient is φ = 5902688000.

The previous prime is 13313815807. The next prime is 13313815883. The reversal of 13313815856 is 65851831331.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3252371 + ... + 3256461.

Almost surely, 2^13313815856 is an apocalyptic number.

13313815856 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 13313815856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14534638734).

13313815856 is an abundant number, since it is smaller than the sum of its proper divisors (15755461612).

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

13313815856 is a wasteful number, since it uses less digits than its factorization.

13313815856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4203 (or 4145 counting only the distinct ones).

The product of its digits is 259200, while the sum is 44.

The spelling of 13313815856 in words is "thirteen billion, three hundred thirteen million, eight hundred fifteen thousand, eight hundred fifty-six".