9987557899 has 4 divisors (see below), whose sum is σ = 10895517720. Its totient is φ = 9079598080.

The previous prime is 9987557891. The next prime is 9987557903.

9987557899 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9987557899 - 2³ = 9987557891 is a prime.

It is a super-3 number, since 3×9987557899³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9987557891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 453979894 + ... + 453979915.

It is an arithmetic number, because the mean of its divisors is an integer number (2723879430).

Almost surely, 2^9987557899 is an apocalyptic number.

9987557899 is a deficient number, since it is larger than the sum of its proper divisors (907959821).

9987557899 is a wasteful number, since it uses less digits than its factorization.

9987557899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907959820.

The product of its digits is 514382400, while the sum is 76.

The square root of 9987557899 is about 99937.7701322178. The cubic root of 9987557899 is about 2153.5407960650.

The spelling of 9987557899 in words is "nine billion, nine hundred eighty-seven million, five hundred fifty-seven thousand, eight hundred ninety-nine".