18081800154 has 64 divisors (see below), whose sum is σ = 44026416000. Its totient is φ = 5455365120.

The previous prime is 18081800153. The next prime is 18081800159. The reversal of 18081800154 is 45100818081.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18081800153) 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 31 ways as a sum of consecutive naturals, for example, 69562 + ... + 202490.

It is an arithmetic number, because the mean of its divisors is an integer number (687912750).

Almost surely, 2^18081800154 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18081800154, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22013208000).

18081800154 is an abundant number, since it is smaller than the sum of its proper divisors (25944615846).

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

18081800154 is a wasteful number, since it uses less digits than its factorization.

18081800154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133180 (or 133174 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 36.

The spelling of 18081800154 in words is "eighteen billion, eighty-one million, eight hundred thousand, one hundred fifty-four".