12206776217 has 2 divisors, whose sum is σ = 12206776218. Its totient is φ = 12206776216.

The previous prime is 12206776187. The next prime is 12206776303. The reversal of 12206776217 is 71267760221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6397440256 + 5809335961 = 79984^2 + 76219^2 .

It is a cyclic number.

It is not a de Polignac number, because 12206776217 - 2¹² = 12206772121 is a prime.

It is a super-2 number, since 2×12206776217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12206776117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6103388108 + 6103388109.

It is an arithmetic number, because the mean of its divisors is an integer number (6103388109).

Almost surely, 2^12206776217 is an apocalyptic number.

It is an amenable number.

12206776217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12206776217 is an equidigital number, since it uses as much as digits as its factorization.

12206776217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 41.

The spelling of 12206776217 in words is "twelve billion, two hundred six million, seven hundred seventy-six thousand, two hundred seventeen".