18908544938 has 8 divisors (see below), whose sum is σ = 28363440000. Its totient is φ = 9454064940.

The previous prime is 18908544937. The next prime is 18908544961. The reversal of 18908544938 is 83944580981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18908544937) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 65063 + ... + 205061.

It is an arithmetic number, because the mean of its divisors is an integer number (3545430000).

Almost surely, 2^18908544938 is an apocalyptic number.

18908544938 is a deficient number, since it is larger than the sum of its proper divisors (9454895062).

18908544938 is a wasteful number, since it uses less digits than its factorization.

18908544938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207532.

The product of its (nonzero) digits is 9953280, while the sum is 59.

The spelling of 18908544938 in words is "eighteen billion, nine hundred eight million, five hundred forty-four thousand, nine hundred thirty-eight".