561166722209 has 2 divisors, whose sum is σ = 561166722210. Its totient is φ = 561166722208.

The previous prime is 561166722191. The next prime is 561166722223. The reversal of 561166722209 is 902227661165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 556724899600 + 4441822609 = 746140^2 + 66647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561166722209 is a prime.

It is a super-2 number, since 2×561166722209² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (561166722269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280583361104 + 280583361105.

It is an arithmetic number, because the mean of its divisors is an integer number (280583361105).

Almost surely, 2^561166722209 is an apocalyptic number.

It is an amenable number.

561166722209 is a deficient number, since it is larger than the sum of its proper divisors (1).

561166722209 is an equidigital number, since it uses as much as digits as its factorization.

561166722209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 561166722209 in words is "five hundred sixty-one billion, one hundred sixty-six million, seven hundred twenty-two thousand, two hundred nine".