18867340217 has 4 divisors (see below), whose sum is σ = 20582552976. Its totient is φ = 17152127460.

The previous prime is 18867340213. The next prime is 18867340267. The reversal of 18867340217 is 71204376881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18867340217 - 2² = 18867340213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18867340213) 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, 857606363 + ... + 857606384.

It is an arithmetic number, because the mean of its divisors is an integer number (5145638244).

Almost surely, 2^18867340217 is an apocalyptic number.

It is an amenable number.

18867340217 is a deficient number, since it is larger than the sum of its proper divisors (1715212759).

18867340217 is a wasteful number, since it uses less digits than its factorization.

18867340217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715212758.

The product of its (nonzero) digits is 451584, while the sum is 47.

The spelling of 18867340217 in words is "eighteen billion, eight hundred sixty-seven million, three hundred forty thousand, two hundred seventeen".