9931955551836 has 24 divisors (see below), whose sum is σ = 23174614150800. Its totient is φ = 3310644536832.

The previous prime is 9931955551829. The next prime is 9931955551841. The reversal of 9931955551836 is 6381555591399.

It is a congruent number.

It is an unprimeable number.

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, 9385740 + ... + 10390188.

It is an arithmetic number, because the mean of its divisors is an integer number (965608922950).

Almost surely, 2^{9931955551836} is an apocalyptic number.

It is an amenable number.

9931955551836 is an abundant number, since it is smaller than the sum of its proper divisors (13242658598964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9931955551836 is a wasteful number, since it uses less digits than its factorization.

9931955551836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828453 (or 1828451 counting only the distinct ones).

The product of its digits is 196830000, while the sum is 69.

The spelling of 9931955551836 in words is "nine trillion, nine hundred thirty-one billion, nine hundred fifty-five million, five hundred fifty-one thousand, eight hundred thirty-six".