220851538166261 has 2 divisors, whose sum is σ = 220851538166262. Its totient is φ = 220851538166260.

The previous prime is 220851538166257. The next prime is 220851538166309. The reversal of 220851538166261 is 162661835158022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219655371600625 + 1196166565636 = 14820775^2 + 1093694^2 .

It is a cyclic number.

It is not a de Polignac number, because 220851538166261 - 2² = 220851538166257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220851538166197 and 220851538166206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220851538136261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110425769083130 + 110425769083131.

It is an arithmetic number, because the mean of its divisors is an integer number (110425769083131).

Almost surely, 2^{220851538166261} is an apocalyptic number.

It is an amenable number.

220851538166261 is a deficient number, since it is larger than the sum of its proper divisors (1).

220851538166261 is an equidigital number, since it uses as much as digits as its factorization.

220851538166261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8294400, while the sum is 56.

The spelling of 220851538166261 in words is "two hundred twenty trillion, eight hundred fifty-one billion, five hundred thirty-eight million, one hundred sixty-six thousand, two hundred sixty-one".