18485854556333 has 2 divisors, whose sum is σ = 18485854556334. Its totient is φ = 18485854556332.

The previous prime is 18485854556263. The next prime is 18485854556341. The reversal of 18485854556333 is 33365545858481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18453742991524 + 32111564809 = 4295782^2 + 179197^2 .

It is an emirp because it is prime and its reverse (33365545858481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18485854556333 - 2¹⁸ = 18485854294189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18485854556033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9242927278166 + 9242927278167.

It is an arithmetic number, because the mean of its divisors is an integer number (9242927278167).

Almost surely, 2^{18485854556333} is an apocalyptic number.

It is an amenable number.

18485854556333 is a deficient number, since it is larger than the sum of its proper divisors (1).

18485854556333 is an equidigital number, since it uses as much as digits as its factorization.

18485854556333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440000, while the sum is 68.

The spelling of 18485854556333 in words is "eighteen trillion, four hundred eighty-five billion, eight hundred fifty-four million, five hundred fifty-six thousand, three hundred thirty-three".