6698558917 has 2 divisors, whose sum is σ = 6698558918. Its totient is φ = 6698558916.

The previous prime is 6698558857. The next prime is 6698558981. The reversal of 6698558917 is 7198558966.

It is an a-pointer prime, because the next prime (6698558981) can be obtained adding 6698558917 to its sum of digits (64).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4126649121 + 2571909796 = 64239^2 + 50714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6698558917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6698558987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3349279458 + 3349279459.

It is an arithmetic number, because the mean of its divisors is an integer number (3349279459).

Almost surely, 2^6698558917 is an apocalyptic number.

It is an amenable number.

6698558917 is a deficient number, since it is larger than the sum of its proper divisors (1).

6698558917 is an equidigital number, since it uses as much as digits as its factorization.

6698558917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32659200, while the sum is 64.

The square root of 6698558917 is about 81844.7244298617. The cubic root of 6698558917 is about 1885.0684603889.

The spelling of 6698558917 in words is "six billion, six hundred ninety-eight million, five hundred fifty-eight thousand, nine hundred seventeen".