8198578117 has 8 divisors (see below), whose sum is σ = 8760490200. Its totient is φ = 7645515264.

The previous prime is 8198578111. The next prime is 8198578121. The reversal of 8198578117 is 7118758918.

It is a Cunningham number, because it is equal to 90546²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1870216516 + 6328361601 = 43246^2 + 79551^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8198578117 - 2¹⁵ = 8198545349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8198578111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2210392 + ... + 2214097.

It is an arithmetic number, because the mean of its divisors is an integer number (1095061275).

Almost surely, 2^8198578117 is an apocalyptic number.

It is an amenable number.

8198578117 is a deficient number, since it is larger than the sum of its proper divisors (561912083).

8198578117 is a wasteful number, since it uses less digits than its factorization.

8198578117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4424615.

The product of its digits is 1128960, while the sum is 55.

The square root of 8198578117 is about 90546.0000055221. Note that the first 5 decimals coincide. The cubic root of 8198578117 is about 2016.4131128194.

The spelling of 8198578117 in words is "eight billion, one hundred ninety-eight million, five hundred seventy-eight thousand, one hundred seventeen".