18361007219 has 4 divisors (see below), whose sum is σ = 19327376040. Its totient is φ = 17394638400.

The previous prime is 18361007207. The next prime is 18361007221. The reversal of 18361007219 is 91270016381.

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-18361007219 is a prime.

It is a super-2 number, since 2×18361007219² (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 (18361007239) 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, 483184382 + ... + 483184419.

It is an arithmetic number, because the mean of its divisors is an integer number (4831844010).

Almost surely, 2^18361007219 is an apocalyptic number.

18361007219 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18361007219 is a deficient number, since it is larger than the sum of its proper divisors (966368821).

18361007219 is an equidigital number, since it uses as much as digits as its factorization.

18361007219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966368820.

The product of its (nonzero) digits is 18144, while the sum is 38.

The spelling of 18361007219 in words is "eighteen billion, three hundred sixty-one million, seven thousand, two hundred nineteen".