218650612067557 has 2 divisors, whose sum is σ = 218650612067558. Its totient is φ = 218650612067556.

The previous prime is 218650612067479. The next prime is 218650612067617. The reversal of 218650612067557 is 755760216056812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210772294964001 + 7878317103556 = 14517999^2 + 2806834^2 .

It is a cyclic number.

It is not a de Polignac number, because 218650612067557 - 2⁷ = 218650612067429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218650612067495 and 218650612067504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218650612067057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109325306033778 + 109325306033779.

It is an arithmetic number, because the mean of its divisors is an integer number (109325306033779).

Almost surely, 2^{218650612067557} is an apocalyptic number.

It is an amenable number.

218650612067557 is a deficient number, since it is larger than the sum of its proper divisors (1).

218650612067557 is an equidigital number, since it uses as much as digits as its factorization.

218650612067557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336000, while the sum is 61.

The spelling of 218650612067557 in words is "two hundred eighteen trillion, six hundred fifty billion, six hundred twelve million, sixty-seven thousand, five hundred fifty-seven".