9881961181399 has 8 divisors (see below), whose sum is σ = 9955339125840. Its totient is φ = 9808715332416.

The previous prime is 9881961181363. The next prime is 9881961181423. The reversal of 9881961181399 is 9931811691889.

It is a happy number.

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 9881961181399 - 2¹³ = 9881961173207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9881961181999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32873689 + ... + 33172930.

It is an arithmetic number, because the mean of its divisors is an integer number (1244417390730).

Almost surely, 2^{9881961181399} is an apocalyptic number.

9881961181399 is a deficient number, since it is larger than the sum of its proper divisors (73377944441).

9881961181399 is a wasteful number, since it uses less digits than its factorization.

9881961181399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66047729.

The product of its digits is 60466176, while the sum is 73.

The spelling of 9881961181399 in words is "nine trillion, eight hundred eighty-one billion, nine hundred sixty-one million, one hundred eighty-one thousand, three hundred ninety-nine".