18458212500 has 576 divisors, whose sum is σ = 73740280320. Its totient is φ = 3888000000.

The previous prime is 18458212483. The next prime is 18458212543. The reversal of 18458212500 is 521285481.

18458212500 is a `hidden beast` number, since 1 + 84 + 58 + 21 + 2 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 30712200 + ... + 30712800.

It is an arithmetic number, because the mean of its divisors is an integer number (128021320).

Almost surely, 2^18458212500 is an apocalyptic number.

18458212500 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 18458212500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36870140160).

18458212500 is an abundant number, since it is smaller than the sum of its proper divisors (55282067820).

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

18458212500 is a wasteful number, since it uses less digits than its factorization.

18458212500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 36.

Adding to 18458212500 its reverse (521285481), we get a palindrome (18979497981).

The spelling of 18458212500 in words is "eighteen billion, four hundred fifty-eight million, two hundred twelve thousand, five hundred".