66670780469 has 2 divisors, whose sum is σ = 66670780470. Its totient is φ = 66670780468.

The previous prime is 66670780439. The next prime is 66670780483. The reversal of 66670780469 is 96408707666.

66670780469 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60780985444 + 5889795025 = 246538^2 + 76745^2 .

It is a cyclic number.

It is not a de Polignac number, because 66670780469 - 2⁸ = 66670780213 is a prime.

It is a super-2 number, since 2×66670780469² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66670780439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335390234 + 33335390235.

It is an arithmetic number, because the mean of its divisors is an integer number (33335390235).

Almost surely, 2^66670780469 is an apocalyptic number.

It is an amenable number.

66670780469 is a deficient number, since it is larger than the sum of its proper divisors (1).

66670780469 is an equidigital number, since it uses as much as digits as its factorization.

66670780469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18289152, while the sum is 59.

The spelling of 66670780469 in words is "sixty-six billion, six hundred seventy million, seven hundred eighty thousand, four hundred sixty-nine".