18144220500 has 288 divisors, whose sum is σ = 65930312448. Its totient is φ = 4114656000.

The previous prime is 18144220463. The next prime is 18144220537. The reversal of 18144220500 is 502244181.

18144220500 is a `hidden beast` number, since 18 + 1 + 442 + 205 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (18144220463) and next prime (18144220537).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4124302 + ... + 4128698.

It is an arithmetic number, because the mean of its divisors is an integer number (228924696).

Almost surely, 2^18144220500 is an apocalyptic number.

18144220500 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 18144220500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32965156224).

18144220500 is an abundant number, since it is smaller than the sum of its proper divisors (47786091948).

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

18144220500 is a wasteful number, since it uses less digits than its factorization.

18144220500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4560 (or 4545 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

Adding to 18144220500 its reverse (502244181), we get a palindrome (18646464681).

The spelling of 18144220500 in words is "eighteen billion, one hundred forty-four million, two hundred twenty thousand, five hundred".