6898817861 has 8 divisors (see below), whose sum is σ = 7430166744. Its totient is φ = 6367564800.

The previous prime is 6898817843. The next prime is 6898817867. The reversal of 6898817861 is 1687188986.

It can be written as a sum of positive squares in 4 ways, for example, as 949009636 + 5949808225 = 30806^2 + 77135^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6898817861 - 2⁶ = 6898817797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6898817794 and 6898817803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6898817867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210965 + ... + 241461.

It is an arithmetic number, because the mean of its divisors is an integer number (928770843).

Almost surely, 2^6898817861 is an apocalyptic number.

It is an amenable number.

6898817861 is a deficient number, since it is larger than the sum of its proper divisors (531348883).

6898817861 is a wasteful number, since it uses less digits than its factorization.

6898817861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47911.

The product of its digits is 9289728, while the sum is 62.

The square root of 6898817861 is about 83059.1226837847. The cubic root of 6898817861 is about 1903.6695344722.

The spelling of 6898817861 in words is "six billion, eight hundred ninety-eight million, eight hundred seventeen thousand, eight hundred sixty-one".