17699720917 has 2 divisors, whose sum is σ = 17699720918. Its totient is φ = 17699720916.

The previous prime is 17699720893. The next prime is 17699720933. The reversal of 17699720917 is 71902799671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8886078756 + 8813642161 = 94266^2 + 93881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17699720917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17699723917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8849860458 + 8849860459.

It is an arithmetic number, because the mean of its divisors is an integer number (8849860459).

Almost surely, 2^17699720917 is an apocalyptic number.

It is an amenable number.

17699720917 is a deficient number, since it is larger than the sum of its proper divisors (1).

17699720917 is an equidigital number, since it uses as much as digits as its factorization.

17699720917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000564, while the sum is 58.

The spelling of 17699720917 in words is "seventeen billion, six hundred ninety-nine million, seven hundred twenty thousand, nine hundred seventeen".