20218333550549 has 2 divisors, whose sum is σ = 20218333550550. Its totient is φ = 20218333550548.

The previous prime is 20218333550537. The next prime is 20218333550621. The reversal of 20218333550549 is 94505533381202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15031245310225 + 5187088240324 = 3877015^2 + 2277518^2 .

It is a cyclic number.

It is not a de Polignac number, because 20218333550549 - 2⁸ = 20218333550293 is a prime.

It is a super-2 number, since 2×20218333550549² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20218333550497 and 20218333550506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20218333550249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109166775274 + 10109166775275.

It is an arithmetic number, because the mean of its divisors is an integer number (10109166775275).

Almost surely, 2^{20218333550549} is an apocalyptic number.

It is an amenable number.

20218333550549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218333550549 is an equidigital number, since it uses as much as digits as its factorization.

20218333550549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888000, while the sum is 50.

The spelling of 20218333550549 in words is "twenty trillion, two hundred eighteen billion, three hundred thirty-three million, five hundred fifty thousand, five hundred forty-nine".