18911536218859 has 2 divisors, whose sum is σ = 18911536218860. Its totient is φ = 18911536218858.

The previous prime is 18911536218781. The next prime is 18911536219001. The reversal of 18911536218859 is 95881263511981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18911536218859 - 2¹³ = 18911536210667 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18911536218794 and 18911536218803.

It is not a weakly prime, because it can be changed into another prime (18911536248859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9455768109429 + 9455768109430.

It is an arithmetic number, because the mean of its divisors is an integer number (9455768109430).

Almost surely, 2^{18911536218859} is an apocalyptic number.

18911536218859 is a deficient number, since it is larger than the sum of its proper divisors (1).

18911536218859 is an equidigital number, since it uses as much as digits as its factorization.

18911536218859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37324800, while the sum is 67.

The spelling of 18911536218859 in words is "eighteen trillion, nine hundred eleven billion, five hundred thirty-six million, two hundred eighteen thousand, eight hundred fifty-nine".