9855971688 has 32 divisors (see below), whose sum is σ = 25936768800. Its totient is φ = 3112411968.

The previous prime is 9855971687. The next prime is 9855971693. The reversal of 9855971688 is 8861795589.

It is a happy number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10806531 + ... + 10807442.

It is an arithmetic number, because the mean of its divisors is an integer number (810524025).

Almost surely, 2^9855971688 is an apocalyptic number.

It is an amenable number.

9855971688 is an abundant number, since it is smaller than the sum of its proper divisors (16080797112).

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

9855971688 is a wasteful number, since it uses less digits than its factorization.

9855971688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21614001 (or 21613997 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 66.

The square root of 9855971688 is about 99277.2465774510. The cubic root of 9855971688 is about 2144.0413114163.

The spelling of 9855971688 in words is "nine billion, eight hundred fifty-five million, nine hundred seventy-one thousand, six hundred eighty-eight".