9981656827 has 8 divisors (see below), whose sum is σ = 10327798800. Its totient is φ = 9635644704.

The previous prime is 9981656813. The next prime is 9981656849. The reversal of 9981656827 is 7286561899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9981656827 - 2¹¹ = 9981654779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9981656887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139449 + ... + 198517.

It is an arithmetic number, because the mean of its divisors is an integer number (1290974850).

Almost surely, 2^9981656827 is an apocalyptic number.

9981656827 is a deficient number, since it is larger than the sum of its proper divisors (346141973).

9981656827 is a wasteful number, since it uses less digits than its factorization.

9981656827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64925.

The product of its digits is 13063680, while the sum is 61.

The square root of 9981656827 is about 99908.2420373815. The cubic root of 9981656827 is about 2153.1165781500.

The spelling of 9981656827 in words is "nine billion, nine hundred eighty-one million, six hundred fifty-six thousand, eight hundred twenty-seven".