9855971660 has 12 divisors (see below), whose sum is σ = 20697540528. Its totient is φ = 3942388656.

The previous prime is 9855971659. The next prime is 9855971687. The reversal of 9855971660 is 661795589.

It is a junction number, because it is equal to n+sod(n) for n = 9855971596 and 9855971605.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246399272 + ... + 246399311.

It is an arithmetic number, because the mean of its divisors is an integer number (1724795044).

Almost surely, 2^9855971660 is an apocalyptic number.

It is an amenable number.

9855971660 is an abundant number, since it is smaller than the sum of its proper divisors (10841568868).

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

9855971660 is a wasteful number, since it uses less digits than its factorization.

9855971660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492798592 (or 492798590 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 56.

The square root of 9855971660 is about 99277.2464364317. The cubic root of 9855971660 is about 2144.0413093859.

The spelling of 9855971660 in words is "nine billion, eight hundred fifty-five million, nine hundred seventy-one thousand, six hundred sixty".