18915368219 has 8 divisors (see below), whose sum is σ = 20636649840. Its totient is φ = 17194370400.

The previous prime is 18915368111. The next prime is 18915368237. The reversal of 18915368219 is 91286351981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18915368219 - 2¹² = 18915364123 is a prime.

It is a super-2 number, since 2×18915368219² (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 (18915368279) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 82937 + ... + 211445.

It is an arithmetic number, because the mean of its divisors is an integer number (2579581230).

Almost surely, 2^18915368219 is an apocalyptic number.

18915368219 is a deficient number, since it is larger than the sum of its proper divisors (1721281621).

18915368219 is a wasteful number, since it uses less digits than its factorization.

18915368219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141901.

The product of its digits is 933120, while the sum is 53.

The spelling of 18915368219 in words is "eighteen billion, nine hundred fifteen million, three hundred sixty-eight thousand, two hundred nineteen".