18989111395 has 16 divisors (see below), whose sum is σ = 23031066240. Its totient is φ = 15028660224.

The previous prime is 18989111387. The next prime is 18989111431. The reversal of 18989111395 is 59311198981.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18989111395 - 2³ = 18989111387 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 1506439 + ... + 1518991.

It is an arithmetic number, because the mean of its divisors is an integer number (1439441640).

Almost surely, 2^18989111395 is an apocalyptic number.

18989111395 is a deficient number, since it is larger than the sum of its proper divisors (4041954845).

18989111395 is a wasteful number, since it uses less digits than its factorization.

18989111395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15774.

The product of its digits is 699840, while the sum is 55.

The spelling of 18989111395 in words is "eighteen billion, nine hundred eighty-nine million, one hundred eleven thousand, three hundred ninety-five".