18778068135 has 128 divisors (see below), whose sum is σ = 36246528000. Its totient is φ = 9198199296.

The previous prime is 18778068103. The next prime is 18778068149. The reversal of 18778068135 is 53186087781.

It is a happy number.

It is not a de Polignac number, because 18778068135 - 2⁵ = 18778068103 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9074881 + ... + 9076949.

It is an arithmetic number, because the mean of its divisors is an integer number (283176000).

Almost surely, 2^18778068135 is an apocalyptic number.

18778068135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18778068135 is a deficient number, since it is larger than the sum of its proper divisors (17468459865).

18778068135 is a wasteful number, since it uses less digits than its factorization.

18778068135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222 (or 2216 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 54.

The spelling of 18778068135 in words is "eighteen billion, seven hundred seventy-eight million, sixty-eight thousand, one hundred thirty-five".