18555499208064 has 256 divisors, whose sum is σ = 60892893895680. Its totient is φ = 4875148173312.

The previous prime is 18555499207997. The next prime is 18555499208117. The reversal of 18555499208064 is 46080299455581.

It is a junction number, because it is equal to n+sod(n) for n = 18555499207986 and 18555499208004.

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 31 ways as a sum of consecutive naturals, for example, 8180754 + ... + 10199790.

It is an arithmetic number, because the mean of its divisors is an integer number (237862866780).

Almost surely, 2^{18555499208064} is an apocalyptic number.

18555499208064 is a gapful number since it is divisible by the number (14) 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 18555499208064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30446446947840).

18555499208064 is an abundant number, since it is smaller than the sum of its proper divisors (42337394687616).

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

18555499208064 is a wasteful number, since it uses less digits than its factorization.

18555499208064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019337 (or 2019325 counting only the distinct ones).

The product of its (nonzero) digits is 124416000, while the sum is 66.

The spelling of 18555499208064 in words is "eighteen trillion, five hundred fifty-five billion, four hundred ninety-nine million, two hundred eight thousand, sixty-four".