18012806500 has 192 divisors, whose sum is σ = 44857193472. Its totient is φ = 6268416000.

The previous prime is 18012806479. The next prime is 18012806503. The reversal of 18012806500 is 560821081.

It is a super-3 number, since 3×18012806500³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (18012806503) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10613652 + ... + 10615348.

It is an arithmetic number, because the mean of its divisors is an integer number (233631216).

Almost surely, 2^18012806500 is an apocalyptic number.

18012806500 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 18012806500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22428596736).

18012806500 is an abundant number, since it is smaller than the sum of its proper divisors (26844386972).

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

18012806500 is a wasteful number, since it uses less digits than its factorization.

18012806500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823 (or 1811 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The spelling of 18012806500 in words is "eighteen billion, twelve million, eight hundred six thousand, five hundred".