18981448194 has 16 divisors (see below), whose sum is σ = 38261818368. Its totient is φ = 6277329072.

The previous prime is 18981448177. The next prime is 18981448217. The reversal of 18981448194 is 49184418981.

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, 12454257 + ... + 12455780.

It is an arithmetic number, because the mean of its divisors is an integer number (2391363648).

Almost surely, 2^18981448194 is an apocalyptic number.

18981448194 is an abundant number, since it is smaller than the sum of its proper divisors (19280370174).

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

18981448194 is a wasteful number, since it uses less digits than its factorization.

18981448194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24910169.

The product of its digits is 2654208, while the sum is 57.

The spelling of 18981448194 in words is "eighteen billion, nine hundred eighty-one million, four hundred forty-eight thousand, one hundred ninety-four".