18988723911 has 16 divisors (see below), whose sum is σ = 26205132800. Its totient is φ = 12217923360.

The previous prime is 18988723889. The next prime is 18988723931. The reversal of 18988723911 is 11932788981.

It is not a de Polignac number, because 18988723911 - 2⁵ = 18988723879 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988723931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239011 + ... + 308388.

It is an arithmetic number, because the mean of its divisors is an integer number (1637820800).

Almost surely, 2^18988723911 is an apocalyptic number.

18988723911 is a deficient number, since it is larger than the sum of its proper divisors (7216408889).

18988723911 is a wasteful number, since it uses less digits than its factorization.

18988723911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547806.

The product of its digits is 1741824, while the sum is 57.

The spelling of 18988723911 in words is "eighteen billion, nine hundred eighty-eight million, seven hundred twenty-three thousand, nine hundred eleven".