18911438481075 has 96 divisors (see below), whose sum is σ = 37656753623040. Its totient is φ = 8180979523200.

The previous prime is 18911438481043. The next prime is 18911438481083. The reversal of 18911438481075 is 57018483411981.

It is a happy number.

It is not a de Polignac number, because 18911438481075 - 2⁵ = 18911438481043 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7779120 + ... + 9916530.

It is an arithmetic number, because the mean of its divisors is an integer number (392257850240).

Almost surely, 2^{18911438481075} is an apocalyptic number.

18911438481075 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18911438481075 is a deficient number, since it is larger than the sum of its proper divisors (18745315141965).

18911438481075 is a wasteful number, since it uses less digits than its factorization.

18911438481075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138337 (or 2138332 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 60.

The spelling of 18911438481075 in words is "eighteen trillion, nine hundred eleven billion, four hundred thirty-eight million, four hundred eighty-one thousand, seventy-five".