18345665219 has 24 divisors (see below), whose sum is σ = 21443564160. Its totient is φ = 15649396224.

The previous prime is 18345665207. The next prime is 18345665227. The reversal of 18345665219 is 91256654381.

It is not a de Polignac number, because 18345665219 - 2¹⁶ = 18345599683 is a prime.

It is a super-2 number, since 2×18345665219² (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 (18345665249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14926697 + ... + 14927925.

It is an arithmetic number, because the mean of its divisors is an integer number (893481840).

Almost surely, 2^18345665219 is an apocalyptic number.

18345665219 is a deficient number, since it is larger than the sum of its proper divisors (3097898941).

18345665219 is a wasteful number, since it uses less digits than its factorization.

18345665219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459 (or 2452 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 50.

The spelling of 18345665219 in words is "eighteen billion, three hundred forty-five million, six hundred sixty-five thousand, two hundred nineteen".