18225875136 has 224 divisors, whose sum is σ = 57121763328. Its totient is φ = 5018849280.

The previous prime is 18225875113. The next prime is 18225875141. The reversal of 18225875136 is 63157852281.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12206806 + ... + 12208298.

It is an arithmetic number, because the mean of its divisors is an integer number (255007872).

Almost surely, 2^18225875136 is an apocalyptic number.

18225875136 is a gapful number since it is divisible by the number (16) 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 18225875136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28560881664).

18225875136 is an abundant number, since it is smaller than the sum of its proper divisors (38895888192).

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

18225875136 is a wasteful number, since it uses less digits than its factorization.

18225875136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1839 (or 1829 counting only the distinct ones).

The product of its digits is 806400, while the sum is 48.

The spelling of 18225875136 in words is "eighteen billion, two hundred twenty-five million, eight hundred seventy-five thousand, one hundred thirty-six".