18497920144 has 80 divisors (see below), whose sum is σ = 40278047040. Its totient is φ = 8156672000.

The previous prime is 18497920141. The next prime is 18497920159. The reversal of 18497920144 is 44102979481.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18497920141) 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 15 ways as a sum of consecutive naturals, for example, 1284504 + ... + 1298824.

It is an arithmetic number, because the mean of its divisors is an integer number (503475588).

Almost surely, 2^18497920144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18497920144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20139023520).

18497920144 is an abundant number, since it is smaller than the sum of its proper divisors (21780126896).

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

18497920144 is a wasteful number, since it uses less digits than its factorization.

18497920144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14560 (or 14554 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 18497920144 in words is "eighteen billion, four hundred ninety-seven million, nine hundred twenty thousand, one hundred forty-four".