18521019511 has 2 divisors, whose sum is σ = 18521019512. Its totient is φ = 18521019510.

The previous prime is 18521019467. The next prime is 18521019523. The reversal of 18521019511 is 11591012581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18521019511 - 2¹⁷ = 18520888439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18521019541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9260509755 + 9260509756.

It is an arithmetic number, because the mean of its divisors is an integer number (9260509756).

Almost surely, 2^18521019511 is an apocalyptic number.

18521019511 is a deficient number, since it is larger than the sum of its proper divisors (1).

18521019511 is an equidigital number, since it uses as much as digits as its factorization.

18521019511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 34.

The spelling of 18521019511 in words is "eighteen billion, five hundred twenty-one million, nineteen thousand, five hundred eleven".