667376531264609 has 2 divisors, whose sum is σ = 667376531264610. Its totient is φ = 667376531264608.

The previous prime is 667376531264591. The next prime is 667376531264699. The reversal of 667376531264609 is 906462135673766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 523964002867600 + 143412528397009 = 22890260^2 + 11975497^2 .

It is a cyclic number.

It is not a de Polignac number, because 667376531264609 - 2²⁴ = 667376514487393 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 (667376531264699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333688265632304 + 333688265632305.

It is an arithmetic number, because the mean of its divisors is an integer number (333688265632305).

Almost surely, 2^{667376531264609} is an apocalyptic number.

It is an amenable number.

667376531264609 is a deficient number, since it is larger than the sum of its proper divisors (1).

667376531264609 is an equidigital number, since it uses as much as digits as its factorization.

667376531264609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1234517760, while the sum is 71.

The spelling of 667376531264609 in words is "six hundred sixty-seven trillion, three hundred seventy-six billion, five hundred thirty-one million, two hundred sixty-four thousand, six hundred nine".