13911218640 has 200 divisors, whose sum is σ = 52708331808. Its totient is φ = 3372399360.

The previous prime is 13911218627. The next prime is 13911218669. The reversal of 13911218640 is 4681211931.

13911218640 is a `hidden beast` number, since 1 + 3 + 9 + 1 + 1 + 2 + 1 + 8 + 640 = 666.

13911218640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 13911218595 and 13911218604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 26302 + ... + 168861.

Almost surely, 2^13911218640 is an apocalyptic number.

13911218640 is a gapful number since it is divisible by the number (10) 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 13911218640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26354165904).

13911218640 is an abundant number, since it is smaller than the sum of its proper divisors (38797113168).

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

13911218640 is a wasteful number, since it uses less digits than its factorization.

13911218640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195199 (or 195184 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The spelling of 13911218640 in words is "thirteen billion, nine hundred eleven million, two hundred eighteen thousand, six hundred forty".