18986307299584 has 27 divisors (see below), whose sum is σ = 37898588498953. Its totient is φ = 9493118791168.

The previous prime is 18986307299581. The next prime is 18986307299639. The reversal of 18986307299584 is 48599270368981.

The square root of 18986307299584 is 4357328.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1799246649600 + 17187060649984 = 1341360^2 + 4145728^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18986307299581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 69581082 + ... + 69853414.

It is a 1-persistent number, because it is pandigital, but 2⋅18986307299584 = 37972614599168 is not.

Almost surely, 2^{18986307299584} is an apocalyptic number.

18986307299584 is the 4357328-th square number.

It is an amenable number.

18986307299584 is a deficient number, since it is larger than the sum of its proper divisors (18912281199369).

18986307299584 is an frugal number, since it uses more digits than its factorization.

18986307299584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544682 (or 272335 counting only the distinct ones).

The product of its (nonzero) digits is 1881169920, while the sum is 79.

The spelling of 18986307299584 in words is "eighteen trillion, nine hundred eighty-six billion, three hundred seven million, two hundred ninety-nine thousand, five hundred eighty-four".