18903633678 has 48 divisors (see below), whose sum is σ = 41655069456. Its totient is φ = 6194517120.

The previous prime is 18903633647. The next prime is 18903633743. The reversal of 18903633678 is 87633630981.

18903633678 is a `hidden beast` number, since 189 + 0 + 363 + 36 + 78 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 379968 + ... + 426828.

It is an arithmetic number, because the mean of its divisors is an integer number (867813947).

Almost surely, 2^18903633678 is an apocalyptic number.

18903633678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18903633678 is an abundant number, since it is smaller than the sum of its proper divisors (22751435778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18903633678 is a wasteful number, since it uses less digits than its factorization.

18903633678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47249 (or 47246 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 18903633678 in words is "eighteen billion, nine hundred three million, six hundred thirty-three thousand, six hundred seventy-eight".