8556249999 has 32 divisors (see below), whose sum is σ = 12534822144. Its totient is φ = 5148506880.

The previous prime is 8556249997. The next prime is 8556250009. The reversal of 8556249999 is 9999426558.

It is a Cunningham number, because it is equal to 92500²-1.

It is not a de Polignac number, because 8556249999 - 2¹ = 8556249997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8556249997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3051132 + ... + 3053934.

It is an arithmetic number, because the mean of its divisors is an integer number (391713192).

Almost surely, 2^8556249999 is an apocalyptic number.

8556249999 is a deficient number, since it is larger than the sum of its proper divisors (3978572145).

8556249999 is a wasteful number, since it uses less digits than its factorization.

8556249999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3447.

The product of its digits is 62985600, while the sum is 66.

The square root of 8556249999 is about 92499.9999945946. Note that the first 5 decimals coincide. The cubic root of 8556249999 is about 2045.3194822106.

The spelling of 8556249999 in words is "eight billion, five hundred fifty-six million, two hundred forty-nine thousand, nine hundred ninety-nine".