18536928517 has 2 divisors, whose sum is σ = 18536928518. Its totient is φ = 18536928516.

The previous prime is 18536928497. The next prime is 18536928521. The reversal of 18536928517 is 71582963581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16598199556 + 1938728961 = 128834^2 + 44031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18536928517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18536928217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9268464258 + 9268464259.

It is an arithmetic number, because the mean of its divisors is an integer number (9268464259).

Almost surely, 2^18536928517 is an apocalyptic number.

It is an amenable number.

18536928517 is a deficient number, since it is larger than the sum of its proper divisors (1).

18536928517 is an equidigital number, since it uses as much as digits as its factorization.

18536928517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3628800, while the sum is 55.

The spelling of 18536928517 in words is "eighteen billion, five hundred thirty-six million, nine hundred twenty-eight thousand, five hundred seventeen".