18157543220 has 54 divisors (see below), whose sum is σ = 39529082502. Its totient is φ = 7005819072.

The previous prime is 18157543219. The next prime is 18157543253. The reversal of 18157543220 is 2234575181.

It can be written as a sum of positive squares in 3 ways, for example, as 2089952656 + 16067590564 = 45716^2 + 126758^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17475461 + ... + 17476499.

Almost surely, 2^18157543220 is an apocalyptic number.

18157543220 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 18157543220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19764541251).

18157543220 is an abundant number, since it is smaller than the sum of its proper divisors (21371539282).

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

18157543220 is an equidigital number, since it uses as much as digits as its factorization.

18157543220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145 (or 1075 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The spelling of 18157543220 in words is "eighteen billion, one hundred fifty-seven million, five hundred forty-three thousand, two hundred twenty".