18881968219 has 16 divisors (see below), whose sum is σ = 20764154880. Its totient is φ = 17102530080.

The previous prime is 18881968199. The next prime is 18881968241. The reversal of 18881968219 is 91286918881.

It is a cyclic number.

It is not a de Polignac number, because 18881968219 - 2¹¹ = 18881966171 is a prime.

It is a super-2 number, since 2×18881968219² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18881968249) 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, 144232 + ... + 242005.

It is an arithmetic number, because the mean of its divisors is an integer number (1297759680).

Almost surely, 2^18881968219 is an apocalyptic number.

18881968219 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18881968219 is a deficient number, since it is larger than the sum of its proper divisors (1882186661).

18881968219 is a wasteful number, since it uses less digits than its factorization.

18881968219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386370.

The product of its digits is 3981312, while the sum is 61.

The spelling of 18881968219 in words is "eighteen billion, eight hundred eighty-one million, nine hundred sixty-eight thousand, two hundred nineteen".