18553279361 has 2 divisors, whose sum is σ = 18553279362. Its totient is φ = 18553279360.

The previous prime is 18553279331. The next prime is 18553279363. The reversal of 18553279361 is 16397235581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10700661136 + 7852618225 = 103444^2 + 88615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18553279361 is a prime.

Together with 18553279363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18553279363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9276639680 + 9276639681.

It is an arithmetic number, because the mean of its divisors is an integer number (9276639681).

Almost surely, 2^18553279361 is an apocalyptic number.

It is an amenable number.

18553279361 is a deficient number, since it is larger than the sum of its proper divisors (1).

18553279361 is an equidigital number, since it uses as much as digits as its factorization.

18553279361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 50.

The spelling of 18553279361 in words is "eighteen billion, five hundred fifty-three million, two hundred seventy-nine thousand, three hundred sixty-one".