9851998805 has 16 divisors (see below), whose sum is σ = 12899779200. Its totient is φ = 7163636160.

The previous prime is 9851998781. The next prime is 9851998811. The reversal of 9851998805 is 5088991589.

It is not a de Polignac number, because 9851998805 - 2¹² = 9851994709 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 308111 + ... + 338579.

It is an arithmetic number, because the mean of its divisors is an integer number (806236200).

Almost surely, 2^9851998805 is an apocalyptic number.

It is an amenable number.

9851998805 is a deficient number, since it is larger than the sum of its proper divisors (3047780395).

9851998805 is a wasteful number, since it uses less digits than its factorization.

9851998805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36364.

The product of its (nonzero) digits is 9331200, while the sum is 62.

The square root of 9851998805 is about 99257.2355297084. The cubic root of 9851998805 is about 2143.7531893070.

The spelling of 9851998805 in words is "nine billion, eight hundred fifty-one million, nine hundred ninety-eight thousand, eight hundred five".