18915380560 has 40 divisors (see below), whose sum is σ = 43992586080. Its totient is φ = 7563687552.

The previous prime is 18915380557. The next prime is 18915380591. The reversal of 18915380560 is 6508351981.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 18915380560.

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 7 ways as a sum of consecutive naturals, for example, 219331 + ... + 293149.

It is an arithmetic number, because the mean of its divisors is an integer number (1099814652).

Almost surely, 2^18915380560 is an apocalyptic number.

18915380560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18915380560 is an abundant number, since it is smaller than the sum of its proper divisors (25077205520).

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

18915380560 is a wasteful number, since it uses less digits than its factorization.

18915380560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77035 (or 77029 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 46.

The spelling of 18915380560 in words is "eighteen billion, nine hundred fifteen million, three hundred eighty thousand, five hundred sixty".