9865719552 has 144 divisors (see below), whose sum is σ = 28405042848. Its totient is φ = 3021864960.

The previous prime is 9865719533. The next prime is 9865719571. The reversal of 9865719552 is 2559175689.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9865719533) and next prime (9865719571).

It is a junction number, because it is equal to n+sod(n) for n = 9865719492 and 9865719501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2324152 + ... + 2328392.

It is an arithmetic number, because the mean of its divisors is an integer number (197257242).

Almost surely, 2^9865719552 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 9865719552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14202521424).

9865719552 is an abundant number, since it is smaller than the sum of its proper divisors (18539323296).

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

9865719552 is a wasteful number, since it uses less digits than its factorization.

9865719552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4506 (or 4492 counting only the distinct ones).

The product of its digits is 6804000, while the sum is 57.

The square root of 9865719552 is about 99326.3285941849. The cubic root of 9865719552 is about 2144.7479198010.

The spelling of 9865719552 in words is "nine billion, eight hundred sixty-five million, seven hundred nineteen thousand, five hundred fifty-two".