9995555987 has 2 divisors, whose sum is σ = 9995555988. Its totient is φ = 9995555986.

The previous prime is 9995555981. The next prime is 9995556047. The reversal of 9995555987 is 7895555999.

It is a weak prime.

It is an emirp because it is prime and its reverse (7895555999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9995555987 - 2⁶ = 9995555923 is a prime.

It is a super-2 number, since 2×9995555987² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9995555987.

It is not a weakly prime, because it can be changed into another prime (9995555981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4997777993 + 4997777994.

It is an arithmetic number, because the mean of its divisors is an integer number (4997777994).

Almost surely, 2^9995555987 is an apocalyptic number.

9995555987 is a deficient number, since it is larger than the sum of its proper divisors (1).

9995555987 is an equidigital number, since it uses as much as digits as its factorization.

9995555987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 229635000, while the sum is 71.

The square root of 9995555987 is about 99977.7774657949. Note that the first 3 decimals coincide. The cubic root of 9995555987 is about 2154.1154982185.

The spelling of 9995555987 in words is "nine billion, nine hundred ninety-five million, five hundred fifty-five thousand, nine hundred eighty-seven".