18713552217 has 4 divisors (see below), whose sum is σ = 24951402960. Its totient is φ = 12475701476.

The previous prime is 18713552201. The next prime is 18713552239. The reversal of 18713552217 is 71225531781.

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 18713552217 - 2⁴ = 18713552201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18713552017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3118925367 + ... + 3118925372.

It is an arithmetic number, because the mean of its divisors is an integer number (6237850740).

Almost surely, 2^18713552217 is an apocalyptic number.

It is an amenable number.

18713552217 is a deficient number, since it is larger than the sum of its proper divisors (6237850743).

18713552217 is an equidigital number, since it uses as much as digits as its factorization.

18713552217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6237850742.

The product of its digits is 117600, while the sum is 42.

The spelling of 18713552217 in words is "eighteen billion, seven hundred thirteen million, five hundred fifty-two thousand, two hundred seventeen".