18218367653 has 2 divisors, whose sum is σ = 18218367654. Its totient is φ = 18218367652.

The previous prime is 18218367641. The next prime is 18218367659. The reversal of 18218367653 is 35676381281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11882526049 + 6335841604 = 109007^2 + 79598^2 .

It is a cyclic number.

It is not a de Polignac number, because 18218367653 - 2⁴ = 18218367637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18218367659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109183826 + 9109183827.

It is an arithmetic number, because the mean of its divisors is an integer number (9109183827).

Almost surely, 2^18218367653 is an apocalyptic number.

It is an amenable number.

18218367653 is a deficient number, since it is larger than the sum of its proper divisors (1).

18218367653 is an equidigital number, since it uses as much as digits as its factorization.

18218367653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 50.

The spelling of 18218367653 in words is "eighteen billion, two hundred eighteen million, three hundred sixty-seven thousand, six hundred fifty-three".