2118243778560 has 1360 divisors, whose sum is σ = 9357412443456. Its totient is φ = 446416551936.

The previous prime is 2118243778517. The next prime is 2118243778577. The reversal of 2118243778560 is 658773428112.

2118243778560 is a `hidden beast` number, since 2 + 1 + 1 + 8 + 2 + 4 + 3 + 7 + 78 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 2118243778497 and 2118243778506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2415328842 + ... + 2415329718.

Almost surely, 2^{2118243778560} is an apocalyptic number.

2118243778560 is a gapful number since it is divisible by the number (20) 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 2118243778560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4678706221728).

2118243778560 is an abundant number, since it is smaller than the sum of its proper divisors (7239168664896).

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

2118243778560 is an frugal number, since it uses more digits than its factorization.

2118243778560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946 (or 907 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 54.

The spelling of 2118243778560 in words is "two trillion, one hundred eighteen billion, two hundred forty-three million, seven hundred seventy-eight thousand, five hundred sixty".