18998692845001 has 27 divisors (see below), whose sum is σ = 20371162806111. Its totient is φ = 17715071775744.

The previous prime is 18998692844987. The next prime is 18998692845043. The reversal of 18998692845001 is 10054829689981.

The square root of 18998692845001 is 4358749.

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 18582125868601 + 416566976400 = 4310699^2 + 645420^2 .

It is not a de Polignac number, because 18998692845001 - 2⁵ = 18998692844969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18998692845101) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 8373155695 + ... + 8373157963.

Almost surely, 2^{18998692845001} is an apocalyptic number.

18998692845001 is the 4358749-th square number.

18998692845001 is the 2179375-th centered octagonal number.

It is an amenable number.

18998692845001 is a deficient number, since it is larger than the sum of its proper divisors (1372469961110).

18998692845001 is an frugal number, since it uses more digits than its factorization.

18998692845001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4798 (or 2399 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 70.

The spelling of 18998692845001 in words is "eighteen trillion, nine hundred ninety-eight billion, six hundred ninety-two million, eight hundred forty-five thousand, one".