9851661120 has 672 divisors, whose sum is σ = 39242244096. Its totient is φ = 2048716800.

The previous prime is 9851661073. The next prime is 9851661121. The reversal of 9851661120 is 211661589.

It is a tau number, because it is divible by the number of its divisors (672).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9851661121) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 75203455 + ... + 75203585.

Almost surely, 2^9851661120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9851661120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19621122048).

9851661120 is an abundant number, since it is smaller than the sum of its proper divisors (29390582976).

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

9851661120 is a wasteful number, since it uses less digits than its factorization.

9851661120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 9851661120 is about 99255.5344552635. The cubic root of 9851661120 is about 2143.7286960855.

The spelling of 9851661120 in words is "nine billion, eight hundred fifty-one million, six hundred sixty-one thousand, one hundred twenty".