18213116461 has 2 divisors, whose sum is σ = 18213116462. Its totient is φ = 18213116460.

The previous prime is 18213116459. The next prime is 18213116479. The reversal of 18213116461 is 16461131281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14402400100 + 3810716361 = 120010^2 + 61731^2 .

It is a cyclic number.

It is not a de Polignac number, because 18213116461 - 2¹ = 18213116459 is a prime.

It is a super-2 number, since 2×18213116461² (a number of 21 digits) contains 22 as substring.

Together with 18213116459, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18213116401) 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 as a sum of consecutive naturals, namely, 9106558230 + 9106558231.

It is an arithmetic number, because the mean of its divisors is an integer number (9106558231).

Almost surely, 2^18213116461 is an apocalyptic number.

It is an amenable number.

18213116461 is a deficient number, since it is larger than the sum of its proper divisors (1).

18213116461 is an equidigital number, since it uses as much as digits as its factorization.

18213116461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 34.

The spelling of 18213116461 in words is "eighteen billion, two hundred thirteen million, one hundred sixteen thousand, four hundred sixty-one".