66212077 has 2 divisors, whose sum is σ = 66212078. Its totient is φ = 66212076.

The previous prime is 66212071. The next prime is 66212087. The reversal of 66212077 is 77021266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62267881 + 3944196 = 7891^2 + 1986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66212077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66212071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33106038 + 33106039.

It is an arithmetic number, because the mean of its divisors is an integer number (33106039).

Almost surely, 2^66212077 is an apocalyptic number.

It is an amenable number.

66212077 is a deficient number, since it is larger than the sum of its proper divisors (1).

66212077 is an equidigital number, since it uses as much as digits as its factorization.

66212077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 66212077 is about 8137.0803732051. The cubic root of 66212077 is about 404.5563948440.

The spelling of 66212077 in words is "sixty-six million, two hundred twelve thousand, seventy-seven".