667443482549 has 2 divisors, whose sum is σ = 667443482550. Its totient is φ = 667443482548.

The previous prime is 667443482513. The next prime is 667443482633. The reversal of 667443482549 is 945284344766.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666211823524 + 1231659025 = 816218^2 + 35095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667443482549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 667443482491 and 667443482500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667443482509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333721741274 + 333721741275.

It is an arithmetic number, because the mean of its divisors is an integer number (333721741275).

Almost surely, 2^667443482549 is an apocalyptic number.

It is an amenable number.

667443482549 is a deficient number, since it is larger than the sum of its proper divisors (1).

667443482549 is an equidigital number, since it uses as much as digits as its factorization.

667443482549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139345920, while the sum is 62.

The spelling of 667443482549 in words is "six hundred sixty-seven billion, four hundred forty-three million, four hundred eighty-two thousand, five hundred forty-nine".