18998701562500 has 243 divisors, whose sum is σ = 45825814916077. Its totient is φ = 6886825000000.

The previous prime is 18998701562483. The next prime is 18998701562531. The reversal of 18998701562500 is 526510789981.

The square root of 18998701562500 is 4358750.

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

It can be written as a sum of positive squares in 13 ways, for example, as 1980172438596 + 17018529123904 = 1407186^2 + 4125352^2 .

It is a super-2 number, since 2×18998701562500² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 59932812342 + ... + 59932812658.

Almost surely, 2^{18998701562500} is an apocalyptic number.

18998701562500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18998701562500 is the 4358750-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18998701562500

18998701562500 is an abundant number, since it is smaller than the sum of its proper divisors (26827113353577).

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

18998701562500 is an frugal number, since it uses more digits than its factorization.

18998701562500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 61.

The spelling of 18998701562500 in words is "eighteen trillion, nine hundred ninety-eight billion, seven hundred one million, five hundred sixty-two thousand, five hundred".