17949218500 has 72 divisors (see below), whose sum is σ = 39989326104. Its totient is φ = 7035662400.

The previous prime is 17949218491. The next prime is 17949218527. The reversal of 17949218500 is 581294971.

It can be written as a sum of positive squares in 4 ways, for example, as 173396224 + 17775822276 = 13168^2 + 133326^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21809089 + ... + 21809911.

It is an arithmetic number, because the mean of its divisors is an integer number (555407307).

Almost surely, 2^17949218500 is an apocalyptic number.

17949218500 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 17949218500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19994663052).

17949218500 is an abundant number, since it is smaller than the sum of its proper divisors (22040107604).

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

17949218500 is an frugal number, since it uses more digits than its factorization.

17949218500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 17949218500 in words is "seventeen billion, nine hundred forty-nine million, two hundred eighteen thousand, five hundred".