18213116353 has 2 divisors, whose sum is σ = 18213116354. Its totient is φ = 18213116352.

The previous prime is 18213116347. The next prime is 18213116401. The reversal of 18213116353 is 35361131281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13799905729 + 4413210624 = 117473^2 + 66432^2 .

It is a cyclic number.

It is not a de Polignac number, because 18213116353 - 2¹⁷ = 18212985281 is a prime.

It is a super-3 number, since 3×18213116353³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (18213116303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106558176 + 9106558177.

It is an arithmetic number, because the mean of its divisors is an integer number (9106558177).

Almost surely, 2^18213116353 is an apocalyptic number.

It is an amenable number.

18213116353 is a deficient number, since it is larger than the sum of its proper divisors (1).

18213116353 is an equidigital number, since it uses as much as digits as its factorization.

18213116353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The spelling of 18213116353 in words is "eighteen billion, two hundred thirteen million, one hundred sixteen thousand, three hundred fifty-three".