18670550219 has 4 divisors (see below), whose sum is σ = 19482313296. Its totient is φ = 17858787144.

The previous prime is 18670550201. The next prime is 18670550257. The reversal of 18670550219 is 91205507681.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18670550219 is a prime.

It is a super-2 number, since 2×18670550219² (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 18670550219.

It is not an unprimeable number, because it can be changed into a prime (18670550419) 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, 405881504 + ... + 405881549.

It is an arithmetic number, because the mean of its divisors is an integer number (4870578324).

Almost surely, 2^18670550219 is an apocalyptic number.

18670550219 is a deficient number, since it is larger than the sum of its proper divisors (811763077).

18670550219 is an equidigital number, since it uses as much as digits as its factorization.

18670550219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811763076.

The product of its (nonzero) digits is 151200, while the sum is 44.

The spelling of 18670550219 in words is "eighteen billion, six hundred seventy million, five hundred fifty thousand, two hundred nineteen".