9855971686 has 16 divisors (see below), whose sum is σ = 16212400128. Its totient is φ = 4456529800.

The previous prime is 9855971659. The next prime is 9855971687. The reversal of 9855971686 is 6861795589.

9855971686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9855971687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1168570 + ... + 1176973.

It is an arithmetic number, because the mean of its divisors is an integer number (1013275008).

Almost surely, 2^9855971686 is an apocalyptic number.

9855971686 is a deficient number, since it is larger than the sum of its proper divisors (6356428442).

9855971686 is a wasteful number, since it uses less digits than its factorization.

9855971686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345747.

The product of its digits is 32659200, while the sum is 64.

The square root of 9855971686 is about 99277.2465673782. The cubic root of 9855971686 is about 2144.0413112712.

The spelling of 9855971686 in words is "nine billion, eight hundred fifty-five million, nine hundred seventy-one thousand, six hundred eighty-six".