66822171061 has 2 divisors, whose sum is σ = 66822171062. Its totient is φ = 66822171060.

The previous prime is 66822171041. The next prime is 66822171121. The reversal of 66822171061 is 16017122866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42727370436 + 24094800625 = 206706^2 + 155225^2 .

It is a cyclic number.

It is not a de Polignac number, because 66822171061 - 2¹⁷ = 66822039989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66822171041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33411085530 + 33411085531.

It is an arithmetic number, because the mean of its divisors is an integer number (33411085531).

Almost surely, 2^66822171061 is an apocalyptic number.

It is an amenable number.

66822171061 is a deficient number, since it is larger than the sum of its proper divisors (1).

66822171061 is an equidigital number, since it uses as much as digits as its factorization.

66822171061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 66822171061 in words is "sixty-six billion, eight hundred twenty-two million, one hundred seventy-one thousand, sixty-one".