9840397866825 has 96 divisors (see below), whose sum is σ = 16428525649920. Its totient is φ = 5197186950400.

The previous prime is 9840397866821. The next prime is 9840397866839. The reversal of 9840397866825 is 5286687930489.

It is not a de Polignac number, because 9840397866825 - 2² = 9840397866821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (75).

It is not an unprimeable number, because it can be changed into a prime (9840397866821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4826089156 + ... + 4826091194.

It is an arithmetic number, because the mean of its divisors is an integer number (171130475520).

Almost surely, 2^{9840397866825} is an apocalyptic number.

It is an amenable number.

9840397866825 is a deficient number, since it is larger than the sum of its proper divisors (6588127783095).

9840397866825 is a wasteful number, since it uses less digits than its factorization.

9840397866825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3519 (or 3514 counting only the distinct ones).

The product of its (nonzero) digits is 1254113280, while the sum is 75.

The spelling of 9840397866825 in words is "nine trillion, eight hundred forty billion, three hundred ninety-seven million, eight hundred sixty-six thousand, eight hundred twenty-five".