9887866509945 has 16 divisors (see below), whose sum is σ = 15821242444800. Its totient is φ = 5273310129024.

The previous prime is 9887866509907. The next prime is 9887866510037. The reversal of 9887866509945 is 5499056687889.

It is a happy number.

It is not a de Polignac number, because 9887866509945 - 2²⁴ = 9887849732729 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13293145 + ... + 14017254.

It is an arithmetic number, because the mean of its divisors is an integer number (988827652800).

Almost surely, 2^{9887866509945} is an apocalyptic number.

It is an amenable number.

9887866509945 is a deficient number, since it is larger than the sum of its proper divisors (5933375934855).

9887866509945 is a wasteful number, since it uses less digits than its factorization.

9887866509945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27334544.

The product of its (nonzero) digits is 9405849600, while the sum is 84.

The spelling of 9887866509945 in words is "nine trillion, eight hundred eighty-seven billion, eight hundred sixty-six million, five hundred nine thousand, nine hundred forty-five".