18911784960 has 416 divisors, whose sum is σ = 70204078080. Its totient is φ = 4820631552.

The previous prime is 18911784869. The next prime is 18911785019. The reversal of 18911784960 is 6948711981.

18911784960 is a `hidden beast` number, since 1 + 89 + 1 + 1 + 78 + 496 + 0 = 666.

It is a super-2 number, since 2×18911784960² (a number of 21 digits) contains 22 as substring.

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 = 18911784897 and 18911784906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12717337 + ... + 12718823.

Almost surely, 2^18911784960 is an apocalyptic number.

18911784960 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 18911784960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35102039040).

18911784960 is an abundant number, since it is smaller than the sum of its proper divisors (51292293120).

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

18911784960 is a wasteful number, since it uses less digits than its factorization.

18911784960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548 (or 1520 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 18911784960 in words is "eighteen billion, nine hundred eleven million, seven hundred eighty-four thousand, nine hundred sixty".