18281061252 has 72 divisors (see below), whose sum is σ = 47212454016. Its totient is φ = 5962192704.

The previous prime is 18281061241. The next prime is 18281061259. The reversal of 18281061252 is 25216018281.

18281061252 is a `hidden beast` number, since 1 + 8 + 28 + 10 + 612 + 5 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (18281061259) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 687183 + ... + 713289.

It is an arithmetic number, because the mean of its divisors is an integer number (655728528).

Almost surely, 2^18281061252 is an apocalyptic number.

18281061252 is a gapful number since it is divisible by the number (12) 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 18281061252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23606227008).

18281061252 is an abundant number, since it is smaller than the sum of its proper divisors (28931392764).

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

18281061252 is a wasteful number, since it uses less digits than its factorization.

18281061252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26537 (or 26532 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The spelling of 18281061252 in words is "eighteen billion, two hundred eighty-one million, sixty-one thousand, two hundred fifty-two".