9871943775825 has 72 divisors (see below), whose sum is σ = 17148726036288. Its totient is φ = 5010554003840.

The previous prime is 9871943775809. The next prime is 9871943775829. The reversal of 9871943775825 is 5285773491789.

It is not a de Polignac number, because 9871943775825 - 2⁴ = 9871943775809 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 (9871943775829) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7184452 + ... + 8447498.

It is an arithmetic number, because the mean of its divisors is an integer number (238176750504).

Almost surely, 2^{9871943775825} is an apocalyptic number.

It is an amenable number.

9871943775825 is a deficient number, since it is larger than the sum of its proper divisors (7276782260463).

9871943775825 is a wasteful number, since it uses less digits than its factorization.

9871943775825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263303 (or 1263275 counting only the distinct ones).

The product of its digits is 1066867200, while the sum is 75.

The spelling of 9871943775825 in words is "nine trillion, eight hundred seventy-one billion, nine hundred forty-three million, seven hundred seventy-five thousand, eight hundred twenty-five".