66822171121 has 2 divisors, whose sum is σ = 66822171122. Its totient is φ = 66822171120.

The previous prime is 66822171061. The next prime is 66822171127. The reversal of 66822171121 is 12117122866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66789166096 + 33005025 = 258436^2 + 5745^2 .

It is a cyclic number.

It is not a de Polignac number, because 66822171121 - 2¹³ = 66822162929 is a prime.

It is not a weakly prime, because it can be changed into another prime (66822171127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33411085560 + 33411085561.

It is an arithmetic number, because the mean of its divisors is an integer number (33411085561).

Almost surely, 2^66822171121 is an apocalyptic number.

It is an amenable number.

66822171121 is a deficient number, since it is larger than the sum of its proper divisors (1).

66822171121 is an equidigital number, since it uses as much as digits as its factorization.

66822171121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

Adding to 66822171121 its reverse (12117122866), we get a palindrome (78939293987).

The spelling of 66822171121 in words is "sixty-six billion, eight hundred twenty-two million, one hundred seventy-one thousand, one hundred twenty-one".