18238502500 has 135 divisors (see below), whose sum is σ = 41560248807. Its totient is φ = 7000992000.

The previous prime is 18238502461. The next prime is 18238502539. The reversal of 18238502500 is 520583281.

The square root of 18238502500 is 135050.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (18238502461) and next prime (18238502539).

It can be written as a sum of positive squares in 22 ways, for example, as 17215014436 + 1023488064 = 131206^2 + 31992^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 249842464 + ... + 249842536.

Almost surely, 2^18238502500 is an apocalyptic number.

18238502500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18238502500 is the 135050-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18238502500

18238502500 is an abundant number, since it is smaller than the sum of its proper divisors (23321746307).

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

18238502500 is an frugal number, since it uses more digits than its factorization.

18238502500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 18238502500 in words is "eighteen billion, two hundred thirty-eight million, five hundred two thousand, five hundred".