9987821475 has 12 divisors (see below), whose sum is σ = 16513198296. Its totient is φ = 5326838080.

The previous prime is 9987821423. The next prime is 9987821533. The reversal of 9987821475 is 5741287899.

It is not a de Polignac number, because 9987821475 - 2¹⁷ = 9987690403 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66585402 + ... + 66585551.

It is an arithmetic number, because the mean of its divisors is an integer number (1376099858).

Almost surely, 2^9987821475 is an apocalyptic number.

9987821475 is a deficient number, since it is larger than the sum of its proper divisors (6525376821).

9987821475 is a wasteful number, since it uses less digits than its factorization.

9987821475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133170966 (or 133170961 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 60.

The square root of 9987821475 is about 99939.0888241433. The cubic root of 9987821475 is about 2153.5597401913.

The spelling of 9987821475 in words is "nine billion, nine hundred eighty-seven million, eight hundred twenty-one thousand, four hundred seventy-five".