18947539886688 has 384 divisors, whose sum is σ = 63889712409600. Its totient is φ = 5350946033664.

The previous prime is 18947539886641. The next prime is 18947539886689. The reversal of 18947539886688 is 88668893574981.

18947539886688 is a `hidden beast` number, since 1 + 8 + 9 + 4 + 7 + 539 + 8 + 8 + 6 + 68 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18947539886598 and 18947539886607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18947539886689) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2948112531 + ... + 2948118957.

It is an arithmetic number, because the mean of its divisors is an integer number (166379459400).

Almost surely, 2^{18947539886688} is an apocalyptic number.

18947539886688 is a gapful number since it is divisible by the number (18) 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 18947539886688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31944856204800).

18947539886688 is an abundant number, since it is smaller than the sum of its proper divisors (44942172522912).

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

18947539886688 is a wasteful number, since it uses less digits than its factorization.

18947539886688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12019 (or 12005 counting only the distinct ones).

The product of its digits is 40131624960, while the sum is 90.

The spelling of 18947539886688 in words is "eighteen trillion, nine hundred forty-seven billion, five hundred thirty-nine million, eight hundred eighty-six thousand, six hundred eighty-eight".