9866952865 has 36 divisors (see below), whose sum is σ = 15139469268. Its totient is φ = 6150809280.

The previous prime is 9866952859. The next prime is 9866952869. The reversal of 9866952865 is 5682596689.

It can be written as a sum of positive squares in 2 ways, for example, as 5317180561 + 4549772304 = 72919^2 + 67452^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9866952865 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9866952797 and 9866952806.

It is not an unprimeable number, because it can be changed into a prime (9866952869) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 136774 + ... + 196063.

It is an arithmetic number, because the mean of its divisors is an integer number (420540813).

Almost surely, 2^9866952865 is an apocalyptic number.

It is an amenable number.

9866952865 is a deficient number, since it is larger than the sum of its proper divisors (5272516403).

9866952865 is a wasteful number, since it uses less digits than its factorization.

9866952865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332878 (or 332860 counting only the distinct ones).

The product of its digits is 55987200, while the sum is 64.

The square root of 9866952865 is about 99332.5367893119. The cubic root of 9866952865 is about 2144.8372876794.

The spelling of 9866952865 in words is "nine billion, eight hundred sixty-six million, nine hundred fifty-two thousand, eight hundred sixty-five".