2009898808681 has 9 divisors (see below), whose sum is σ = 2019770146173. Its totient is φ = 2000075503020.

The previous prime is 2009898808669. The next prime is 2009898808703. The reversal of 2009898808681 is 1868088989002.

The square root of 2009898808681 is 1417709.

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

It is not a de Polignac number, because 2009898808681 - 2⁵ = 2009898808649 is a prime.

It is a super-2 number, since 2×2009898808681² (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 (2009898808661) 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, 299133240 + ... + 299139958.

Almost surely, 2^{2009898808681} is an apocalyptic number.

2009898808681 is the 1417709-th square number.

2009898808681 is the 708855-th centered octagonal number.

It is an amenable number.

2009898808681 is a deficient number, since it is larger than the sum of its proper divisors (9871337492).

2009898808681 is an frugal number, since it uses more digits than its factorization.

2009898808681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13860 (or 6930 counting only the distinct ones).

The product of its (nonzero) digits is 31850496, while the sum is 67.

The spelling of 2009898808681 in words is "two trillion, nine billion, eight hundred ninety-eight million, eight hundred eight thousand, six hundred eighty-one".