1998236688100 has 27 divisors (see below), whose sum is σ = 4336204288297. Its totient is φ = 799289020880.

The previous prime is 1998236688083. The next prime is 1998236688101. The reversal of 1998236688100 is 18866328991.

The square root of 1998236688100 is 1413590.

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

It can be written as a sum of positive squares in only one way, i.e., 719365207716 + 1278871480384 = 848154^2 + 1130872^2 .

It is a super-2 number, since 2×1998236688100² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998236688101) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14065221 + ... + 14206579.

Almost surely, 2^{1998236688100} is an apocalyptic number.

1998236688100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998236688100 is the 1413590-th square number.

It is an amenable number.

1998236688100 is an abundant number, since it is smaller than the sum of its proper divisors (2337967600197).

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

1998236688100 is an frugal number, since it uses more digits than its factorization.

1998236688100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282732 (or 141366 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 61.

The spelling of 1998236688100 in words is "one trillion, nine hundred ninety-eight billion, two hundred thirty-six million, six hundred eighty-eight thousand, one hundred".