9861981401205 has 160 divisors (see below), whose sum is σ = 19037044224000. Its totient is φ = 4868628156288.

The previous prime is 9861981401203. The next prime is 9861981401213. The reversal of 9861981401205 is 5021041891689.

9861981401205 is a `hidden beast` number, since 9 + 8 + 619 + 8 + 1 + 4 + 0 + 12 + 0 + 5 = 666.

It is not a de Polignac number, because 9861981401205 - 2¹ = 9861981401203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9861981401203) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 216614574 + ... + 216660096.

It is an arithmetic number, because the mean of its divisors is an integer number (118981526400).

Almost surely, 2^{9861981401205} is an apocalyptic number.

9861981401205 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

9861981401205 is a deficient number, since it is larger than the sum of its proper divisors (9175062822795).

9861981401205 is a wasteful number, since it uses less digits than its factorization.

9861981401205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46205 (or 46196 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 9861981401205 in words is "nine trillion, eight hundred sixty-one billion, nine hundred eighty-one million, four hundred one thousand, two hundred five".