10780666217 has 2 divisors, whose sum is σ = 10780666218. Its totient is φ = 10780666216.

The previous prime is 10780666187. The next prime is 10780666301. The reversal of 10780666217 is 71266608701.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8405955856 + 2374710361 = 91684^2 + 48731^2 .

It is a cyclic number.

It is not a de Polignac number, because 10780666217 - 2¹⁰ = 10780665193 is a prime.

It is not a weakly prime, because it can be changed into another prime (10780666517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5390333108 + 5390333109.

It is an arithmetic number, because the mean of its divisors is an integer number (5390333109).

Almost surely, 2^10780666217 is an apocalyptic number.

It is an amenable number.

10780666217 is a deficient number, since it is larger than the sum of its proper divisors (1).

10780666217 is an equidigital number, since it uses as much as digits as its factorization.

10780666217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 10780666217 in words is "ten billion, seven hundred eighty million, six hundred sixty-six thousand, two hundred seventeen".