18091256508384 has 48 divisors (see below), whose sum is σ = 47500242889680. Its totient is φ = 6029060797440.

The previous prime is 18091256508373. The next prime is 18091256508397. The reversal of 18091256508384 is 48380565219081.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20790799 + ... + 21643470.

It is an arithmetic number, because the mean of its divisors is an integer number (989588393535).

Almost surely, 2^{18091256508384} is an apocalyptic number.

It is an amenable number.

18091256508384 is an abundant number, since it is smaller than the sum of its proper divisors (29408986381296).

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

18091256508384 is a wasteful number, since it uses less digits than its factorization.

18091256508384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42438723 (or 42438715 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 60.

The spelling of 18091256508384 in words is "eighteen trillion, ninety-one billion, two hundred fifty-six million, five hundred eight thousand, three hundred eighty-four".