66222077 has 2 divisors, whose sum is σ = 66222078. Its totient is φ = 66222076.

The previous prime is 66222073. The next prime is 66222097. The reversal of 66222077 is 77022266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43744996 + 22477081 = 6614^2 + 4741^2 .

It is a cyclic number.

It is not a de Polignac number, because 66222077 - 2² = 66222073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66222073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33111038 + 33111039.

It is an arithmetic number, because the mean of its divisors is an integer number (33111039).

Almost surely, 2^66222077 is an apocalyptic number.

It is an amenable number.

66222077 is a deficient number, since it is larger than the sum of its proper divisors (1).

66222077 is an equidigital number, since it uses as much as digits as its factorization.

66222077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 66222077 is about 8137.6948210166. The cubic root of 66222077 is about 404.5767605159.

The spelling of 66222077 in words is "sixty-six million, two hundred twenty-two thousand, seventy-seven".