18543973327955 has 12 divisors (see below), whose sum is σ = 22423933261056. Its totient is φ = 14721932955600.

The previous prime is 18543973327829. The next prime is 18543973327963. The reversal of 18543973327955 is 55972337934581.

It is a de Polignac number, because none of the positive numbers 2^k-18543973327955 is a prime.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 107973011 + ... + 108144620.

It is an arithmetic number, because the mean of its divisors is an integer number (1868661105088).

Almost surely, 2^{18543973327955} is an apocalyptic number.

18543973327955 is a deficient number, since it is larger than the sum of its proper divisors (3879959933101).

18543973327955 is an equidigital number, since it uses as much as digits as its factorization.

18543973327955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216117898 (or 216117767 counting only the distinct ones).

The product of its digits is 857304000, while the sum is 71.

The spelling of 18543973327955 in words is "eighteen trillion, five hundred forty-three billion, nine hundred seventy-three million, three hundred twenty-seven thousand, nine hundred fifty-five".