66670646729 has 2 divisors, whose sum is σ = 66670646730. Its totient is φ = 66670646728.

The previous prime is 66670646717. The next prime is 66670646741. The reversal of 66670646729 is 92764607666.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (66670646717) and next prime (66670646741).

It can be written as a sum of positive squares in only one way, i.e., 64578499129 + 2092147600 = 254123^2 + 45740^2 .

It is a cyclic number.

It is not a de Polignac number, because 66670646729 - 2²⁸ = 66402211273 is a prime.

It is not a weakly prime, because it can be changed into another prime (66670646629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335323364 + 33335323365.

It is an arithmetic number, because the mean of its divisors is an integer number (33335323365).

Almost surely, 2^66670646729 is an apocalyptic number.

It is an amenable number.

66670646729 is a deficient number, since it is larger than the sum of its proper divisors (1).

66670646729 is an equidigital number, since it uses as much as digits as its factorization.

66670646729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27433728, while the sum is 59.

The spelling of 66670646729 in words is "sixty-six billion, six hundred seventy million, six hundred forty-six thousand, seven hundred twenty-nine".