18027561311905 has 16 divisors (see below), whose sum is σ = 21723636473280. Its totient is φ = 14361797382592.

The previous prime is 18027561311863. The next prime is 18027561311927. The reversal of 18027561311905 is 50911316572081.

It is a cyclic number.

It is not a de Polignac number, because 18027561311905 - 2⁷ = 18027561311777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6557539 + ... + 8891368.

It is an arithmetic number, because the mean of its divisors is an integer number (1357727279580).

Almost surely, 2^{18027561311905} is an apocalyptic number.

It is an amenable number.

18027561311905 is a deficient number, since it is larger than the sum of its proper divisors (3696075161375).

18027561311905 is a wasteful number, since it uses less digits than its factorization.

18027561311905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15449888.

The product of its (nonzero) digits is 453600, while the sum is 49.

Adding to 18027561311905 its reverse (50911316572081), we get a palindrome (68938877883986).

The spelling of 18027561311905 in words is "eighteen trillion, twenty-seven billion, five hundred sixty-one million, three hundred eleven thousand, nine hundred five".