9855971658 has 48 divisors (see below), whose sum is σ = 23004648576. Its totient is φ = 3031633440.

The previous prime is 9855971641. The next prime is 9855971659. The reversal of 9855971658 is 8561795589.

9855971658 is a `hidden beast` number, since 9 + 8 + 559 + 71 + 6 + 5 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 9855971595 and 9855971604.

It is not an unprimeable number, because it can be changed into a prime (9855971659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1135491 + ... + 1144137.

It is an arithmetic number, because the mean of its divisors is an integer number (479263512).

Almost surely, 2^9855971658 is an apocalyptic number.

9855971658 is an abundant number, since it is smaller than the sum of its proper divisors (13148676918).

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

9855971658 is a wasteful number, since it uses less digits than its factorization.

9855971658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13539 (or 13536 counting only the distinct ones).

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

The square root of 9855971658 is about 99277.2464263589. The cubic root of 9855971658 is about 2144.0413092409.

The spelling of 9855971658 in words is "nine billion, eight hundred fifty-five million, nine hundred seventy-one thousand, six hundred fifty-eight".