9855971685 has 48 divisors (see below), whose sum is σ = 19815659136. Its totient is φ = 4438329984.

The previous prime is 9855971659. The next prime is 9855971687. The reversal of 9855971685 is 5861795589.

9855971685 is a `hidden beast` number, since 9 + 8 + 559 + 71 + 6 + 8 + 5 = 666.

9855971685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9855971685 - 2¹³ = 9855963493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

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 47 ways as a sum of consecutive naturals, for example, 212394 + ... + 254603.

It is an arithmetic number, because the mean of its divisors is an integer number (412826232).

Almost surely, 2^9855971685 is an apocalyptic number.

It is an amenable number.

9855971685 is an abundant number, since it is smaller than the sum of its proper divisors (9959687451).

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

9855971685 is a wasteful number, since it uses less digits than its factorization.

9855971685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467082 (or 467079 counting only the distinct ones).

The product of its digits is 27216000, while the sum is 63.

The square root of 9855971685 is about 99277.2465623418. The cubic root of 9855971685 is about 2144.0413111987.

The spelling of 9855971685 in words is "nine billion, eight hundred fifty-five million, nine hundred seventy-one thousand, six hundred eighty-five".