9855658440 has 96 divisors (see below), whose sum is σ = 32043211200. Its totient is φ = 2627164800.

The previous prime is 9855658427. The next prime is 9855658457. The reversal of 9855658440 is 448565589.

9855658440 is a `hidden beast` number, since 9 + 8 + 5 + 56 + 584 + 4 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1681515 + ... + 1687365.

It is an arithmetic number, because the mean of its divisors is an integer number (333783450).

Almost surely, 2^9855658440 is an apocalyptic number.

9855658440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9855658440 is an abundant number, since it is smaller than the sum of its proper divisors (22187552760).

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

9855658440 is a wasteful number, since it uses less digits than its factorization.

9855658440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10547 (or 10540 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 54.

The square root of 9855658440 is about 99275.6689224505. The cubic root of 9855658440 is about 2144.0185968026.

The spelling of 9855658440 in words is "nine billion, eight hundred fifty-five million, six hundred fifty-eight thousand, four hundred forty".