66422861 has 2 divisors, whose sum is σ = 66422862. Its totient is φ = 66422860.

The previous prime is 66422761. The next prime is 66422887. The reversal of 66422861 is 16822466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66422500 + 361 = 8150^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 66422861 - 2¹⁰ = 66421837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66422761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33211430 + 33211431.

It is an arithmetic number, because the mean of its divisors is an integer number (33211431).

Almost surely, 2^66422861 is an apocalyptic number.

It is an amenable number.

66422861 is a deficient number, since it is larger than the sum of its proper divisors (1).

66422861 is an equidigital number, since it uses as much as digits as its factorization.

66422861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 66422861 is about 8150.0221472092. The cubic root of 66422861 is about 404.9852374846.

The spelling of 66422861 in words is "sixty-six million, four hundred twenty-two thousand, eight hundred sixty-one".