18436489500 has 768 divisors, whose sum is σ = 68263243776. Its totient is φ = 3801600000.

The previous prime is 18436489459. The next prime is 18436489501. The reversal of 18436489500 is 598463481.

It is a super-2 number, since 2×18436489500² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18436489500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18436489501) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 182539450 + ... + 182539550.

It is an arithmetic number, because the mean of its divisors is an integer number (88884432).

Almost surely, 2^18436489500 is an apocalyptic number.

18436489500 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 18436489500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34131621888).

18436489500 is an abundant number, since it is smaller than the sum of its proper divisors (49826754276).

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

18436489500 is a wasteful number, since it uses less digits than its factorization.

18436489500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 18436489500 in words is "eighteen billion, four hundred thirty-six million, four hundred eighty-nine thousand, five hundred".