667441424609 has 2 divisors, whose sum is σ = 667441424610. Its totient is φ = 667441424608.

The previous prime is 667441424599. The next prime is 667441424653. The reversal of 667441424609 is 906424144766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 613876951009 + 53564473600 = 783503^2 + 231440^2 .

It is a cyclic number.

It is not a de Polignac number, because 667441424609 - 2²⁰ = 667440376033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (667441424669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333720712304 + 333720712305.

It is an arithmetic number, because the mean of its divisors is an integer number (333720712305).

Almost surely, 2^667441424609 is an apocalyptic number.

It is an amenable number.

667441424609 is a deficient number, since it is larger than the sum of its proper divisors (1).

667441424609 is an equidigital number, since it uses as much as digits as its factorization.

667441424609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6967296, while the sum is 53.

The spelling of 667441424609 in words is "six hundred sixty-seven billion, four hundred forty-one million, four hundred twenty-four thousand, six hundred nine".