18884705217 has 32 divisors (see below), whose sum is σ = 28938608640. Its totient is φ = 10730677440.

The previous prime is 18884705183. The next prime is 18884705249. The reversal of 18884705217 is 71250748881.

It is not a de Polignac number, because 18884705217 - 2⁷ = 18884705089 is a prime.

It is a super-2 number, since 2×18884705217² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18884705217.

It is not an unprimeable number, because it can be changed into a prime (18884705117) 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 31 ways as a sum of consecutive naturals, for example, 4118308 + ... + 4122890.

It is an arithmetic number, because the mean of its divisors is an integer number (904331520).

Almost surely, 2^18884705217 is an apocalyptic number.

It is an amenable number.

18884705217 is a deficient number, since it is larger than the sum of its proper divisors (10053903423).

18884705217 is a wasteful number, since it uses less digits than its factorization.

18884705217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5653.

The product of its (nonzero) digits is 1003520, while the sum is 51.

The spelling of 18884705217 in words is "eighteen billion, eight hundred eighty-four million, seven hundred five thousand, two hundred seventeen".