9995555999 has 16 divisors (see below), whose sum is σ = 11857058304. Its totient is φ = 8306431200.

The previous prime is 9995555987. The next prime is 9995556047.

9995555999 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 9995555999 - 2¹² = 9995551903 is a prime.

It is a super-2 number, since 2×9995555999² (a number of 21 digits) contains 22 as substring.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9995555939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 324587 + ... + 354044.

It is an arithmetic number, because the mean of its divisors is an integer number (741066144).

Almost surely, 2^9995555999 is an apocalyptic number.

9995555999 is a deficient number, since it is larger than the sum of its proper divisors (1861502305).

9995555999 is a wasteful number, since it uses less digits than its factorization.

9995555999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678758.

The product of its digits is 332150625, while the sum is 74.

The square root of 9995555999 is about 99977.7775258082. Note that the first 3 decimals coincide. The cubic root of 9995555999 is about 2154.1154990805.

The spelling of 9995555999 in words is "nine billion, nine hundred ninety-five million, five hundred fifty-five thousand, nine hundred ninety-nine".