9999887555 has 32 divisors (see below), whose sum is σ = 14017536000. Its totient is φ = 6705607680.

The previous prime is 9999887539. The next prime is 9999887567. The reversal of 9999887555 is 5557889999.

It is not a de Polignac number, because 9999887555 - 2⁴ = 9999887539 is a prime.

It is a super-2 number, since 2×9999887555² (a number of 21 digits) contains 22 as substring.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3286835 + ... + 3289875.

It is an arithmetic number, because the mean of its divisors is an integer number (438048000).

Almost surely, 2^9999887555 is an apocalyptic number.

9999887555 is a deficient number, since it is larger than the sum of its proper divisors (4017648445).

9999887555 is a wasteful number, since it uses less digits than its factorization.

9999887555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5099.

The product of its digits is 367416000, while the sum is 74.

The square root of 9999887555 is about 99999.4377734195. The cubic root of 9999887555 is about 2154.4266148213.

The spelling of 9999887555 in words is "nine billion, nine hundred ninety-nine million, eight hundred eighty-seven thousand, five hundred fifty-five".