18387220205055 has 32 divisors (see below), whose sum is σ = 33350099811840. Its totient is φ = 8575739948160.

The previous prime is 18387220205009. The next prime is 18387220205059. The reversal of 18387220205055 is 55050202278381.

It is not a de Polignac number, because 18387220205055 - 2¹⁷ = 18387220073983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18387220204995 and 18387220205013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18387220205059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2481402531 + ... + 2481409940.

It is an arithmetic number, because the mean of its divisors is an integer number (1042190619120).

Almost surely, 2^{18387220205055} is an apocalyptic number.

18387220205055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18387220205055 is a deficient number, since it is larger than the sum of its proper divisors (14962879606785).

18387220205055 is a wasteful number, since it uses less digits than its factorization.

18387220205055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4962812511.

The product of its (nonzero) digits is 1344000, while the sum is 48.

The spelling of 18387220205055 in words is "eighteen trillion, three hundred eighty-seven billion, two hundred twenty million, two hundred five thousand, fifty-five".