6198778917 has 12 divisors (see below), whose sum is σ = 8955582220. Its totient is φ = 4131692928.

The previous prime is 6198778909. The next prime is 6198778931. The reversal of 6198778917 is 7198778916.

6198778917 is a `hidden beast` number, since 619 + 8 + 7 + 7 + 8 + 9 + 1 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2583282276 + 3615496641 = 50826^2 + 60129^2 .

It is not a de Polignac number, because 6198778917 - 2³ = 6198778909 is a prime.

It is a super-4 number, since 4×6198778917⁴ (a number of 40 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6198778517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19492 + ... + 113037.

Almost surely, 2^6198778917 is an apocalyptic number.

It is an amenable number.

6198778917 is a deficient number, since it is larger than the sum of its proper divisors (2756803303).

6198778917 is a wasteful number, since it uses less digits than its factorization.

6198778917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137732 (or 137729 counting only the distinct ones).

The product of its digits is 10668672, while the sum is 63.

The square root of 6198778917 is about 78732.3244734969. The cubic root of 6198778917 is about 1836.9699377925.

Subtracting 6198778917 from its reverse (7198778916), we obtain a palindrome (999999999).

The spelling of 6198778917 in words is "six billion, one hundred ninety-eight million, seven hundred seventy-eight thousand, nine hundred seventeen".