18358518517 has 2 divisors, whose sum is σ = 18358518518. Its totient is φ = 18358518516.

The previous prime is 18358518457. The next prime is 18358518559. The reversal of 18358518517 is 71581585381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10516707601 + 7841810916 = 102551^2 + 88554^2 .

It is a cyclic number.

It is not a de Polignac number, because 18358518517 - 2¹¹ = 18358516469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18358518317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9179259258 + 9179259259.

It is an arithmetic number, because the mean of its divisors is an integer number (9179259259).

Almost surely, 2^18358518517 is an apocalyptic number.

It is an amenable number.

18358518517 is a deficient number, since it is larger than the sum of its proper divisors (1).

18358518517 is an equidigital number, since it uses as much as digits as its factorization.

18358518517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344000, while the sum is 52.

The spelling of 18358518517 in words is "eighteen billion, three hundred fifty-eight million, five hundred eighteen thousand, five hundred seventeen".