18949430880 has 144 divisors (see below), whose sum is σ = 65004436224. Its totient is φ = 5026652160.

The previous prime is 18949430867. The next prime is 18949430887. The reversal of 18949430880 is 8803494981.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18949430887) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 240592 + ... + 309488.

It is an arithmetic number, because the mean of its divisors is an integer number (451419696).

Almost surely, 2^18949430880 is an apocalyptic number.

18949430880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18949430880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32502218112).

18949430880 is an abundant number, since it is smaller than the sum of its proper divisors (46055005344).

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

18949430880 is a wasteful number, since it uses less digits than its factorization.

18949430880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69109 (or 69098 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 18949430880 in words is "eighteen billion, nine hundred forty-nine million, four hundred thirty thousand, eight hundred eighty".