9981779931027 has 16 divisors (see below), whose sum is σ = 14787887824000. Its totient is φ = 6654490387272.

The previous prime is 9981779930989. The next prime is 9981779931037. The reversal of 9981779931027 is 7201399771899.

It is not a de Polignac number, because 9981779931027 - 2²⁴ = 9981763153811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9981779931037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6581124 + ... + 7954542.

It is an arithmetic number, because the mean of its divisors is an integer number (924242989000).

Almost surely, 2^{9981779931027} is an apocalyptic number.

9981779931027 is a deficient number, since it is larger than the sum of its proper divisors (4806107892973).

9981779931027 is a wasteful number, since it uses less digits than its factorization.

9981779931027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642607 (or 1642601 counting only the distinct ones).

The product of its (nonzero) digits is 108020304, while the sum is 72.

The spelling of 9981779931027 in words is "nine trillion, nine hundred eighty-one billion, seven hundred seventy-nine million, nine hundred thirty-one thousand, twenty-seven".