18242172000 has 960 divisors, whose sum is σ = 74319493248. Its totient is φ = 4354560000.

The previous prime is 18242171921. The next prime is 18242172007. The reversal of 18242172000 is 27124281.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18242172007) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 256931965 + ... + 256932035.

Almost surely, 2^18242172000 is an apocalyptic number.

18242172000 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 18242172000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37159746624).

18242172000 is an abundant number, since it is smaller than the sum of its proper divisors (56077321248).

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

18242172000 is a wasteful number, since it uses less digits than its factorization.

18242172000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

Adding to 18242172000 its reverse (27124281), we get a palindrome (18269296281).

The spelling of 18242172000 in words is "eighteen billion, two hundred forty-two million, one hundred seventy-two thousand".