18778068136 has 32 divisors (see below), whose sum is σ = 35537415840. Its totient is φ = 9301791168.

The previous prime is 18778068103. The next prime is 18778068149. The reversal of 18778068136 is 63186087781.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390655 + ... + 436081.

It is an arithmetic number, because the mean of its divisors is an integer number (1110544245).

Almost surely, 2^18778068136 is an apocalyptic number.

It is an amenable number.

18778068136 is a deficient number, since it is larger than the sum of its proper divisors (16759347704).

18778068136 is a wasteful number, since it uses less digits than its factorization.

18778068136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45913 (or 45909 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 55.

The spelling of 18778068136 in words is "eighteen billion, seven hundred seventy-eight million, sixty-eight thousand, one hundred thirty-six".