667670742461 has 2 divisors, whose sum is σ = 667670742462. Its totient is φ = 667670742460.

The previous prime is 667670742443. The next prime is 667670742463. The reversal of 667670742461 is 164247076766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 368122506361 + 299548236100 = 606731^2 + 547310^2 .

It is a cyclic number.

It is not a de Polignac number, because 667670742461 - 2³⁰ = 666597000637 is a prime.

It is a Sophie Germain prime.

Together with 667670742463, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 667670742397 and 667670742406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667670742463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333835371230 + 333835371231.

It is an arithmetic number, because the mean of its divisors is an integer number (333835371231).

Almost surely, 2^667670742461 is an apocalyptic number.

It is an amenable number.

667670742461 is a deficient number, since it is larger than the sum of its proper divisors (1).

667670742461 is an equidigital number, since it uses as much as digits as its factorization.

667670742461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14224896, while the sum is 56.

The spelling of 667670742461 in words is "six hundred sixty-seven billion, six hundred seventy million, seven hundred forty-two thousand, four hundred sixty-one".