18981377119 has 4 divisors (see below), whose sum is σ = 18981801144. Its totient is φ = 18980953096.

The previous prime is 18981377111. The next prime is 18981377213. The reversal of 18981377119 is 91177318981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18981377119 - 2³ = 18981377111 is a prime.

It is a super-2 number, since 2×18981377119² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18981377119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18981377111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135712 + ... + 237445.

It is an arithmetic number, because the mean of its divisors is an integer number (4745450286).

Almost surely, 2^18981377119 is an apocalyptic number.

18981377119 is a deficient number, since it is larger than the sum of its proper divisors (424025).

18981377119 is an equidigital number, since it uses as much as digits as its factorization.

18981377119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424024.

The product of its digits is 762048, while the sum is 55.

The spelling of 18981377119 in words is "eighteen billion, nine hundred eighty-one million, three hundred seventy-seven thousand, one hundred nineteen".