18213116401 has 2 divisors, whose sum is σ = 18213116402. Its totient is φ = 18213116400.

The previous prime is 18213116353. The next prime is 18213116429. The reversal of 18213116401 is 10461131281.

It is an a-pointer prime, because the next prime (18213116429) can be obtained adding 18213116401 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15190316001 + 3022800400 = 123249^2 + 54980^2 .

It is a cyclic number.

It is not a de Polignac number, because 18213116401 - 2³³ = 9623181809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18213116401.

It is not a weakly prime, because it can be changed into another prime (18213116461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9106558200 + 9106558201.

It is an arithmetic number, because the mean of its divisors is an integer number (9106558201).

Almost surely, 2^18213116401 is an apocalyptic number.

It is an amenable number.

18213116401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18213116401 is an equidigital number, since it uses as much as digits as its factorization.

18213116401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 28.

Adding to 18213116401 its reverse (10461131281), we get a palindrome (28674247682).

The spelling of 18213116401 in words is "eighteen billion, two hundred thirteen million, one hundred sixteen thousand, four hundred one".