9980918268281 has 4 divisors (see below), whose sum is σ = 9990325355364. Its totient is φ = 9971511181200.

The previous prime is 9980918268229. The next prime is 9980918268323. The reversal of 9980918268281 is 1828628190899.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9030505806400 + 950412461881 = 3005080^2 + 974891^2 .

It is a cyclic number.

It is not a de Polignac number, because 9980918268281 - 2³⁸ = 9706040361337 is a prime.

It is a super-2 number, since 2×9980918268281² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9980918268781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4703541950 + ... + 4703544071.

It is an arithmetic number, because the mean of its divisors is an integer number (2497581338841).

Almost surely, 2^{9980918268281} is an apocalyptic number.

It is an amenable number.

9980918268281 is a deficient number, since it is larger than the sum of its proper divisors (9407087083).

9980918268281 is a wasteful number, since it uses less digits than its factorization.

9980918268281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9407087082.

The product of its (nonzero) digits is 71663616, while the sum is 71.

The spelling of 9980918268281 in words is "nine trillion, nine hundred eighty billion, nine hundred eighteen million, two hundred sixty-eight thousand, two hundred eighty-one".