670187205656509 has 2 divisors, whose sum is σ = 670187205656510. Its totient is φ = 670187205656508.

The previous prime is 670187205656497. The next prime is 670187205656531. The reversal of 670187205656509 is 905656502781076.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624986500072900 + 45200705583609 = 24999730^2 + 6723147^2 .

It is a cyclic number.

It is not a de Polignac number, because 670187205656509 - 2⁹ = 670187205655997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (670187205656009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335093602828254 + 335093602828255.

It is an arithmetic number, because the mean of its divisors is an integer number (335093602828255).

Almost surely, 2^{670187205656509} is an apocalyptic number.

It is an amenable number.

670187205656509 is a deficient number, since it is larger than the sum of its proper divisors (1).

670187205656509 is an equidigital number, since it uses as much as digits as its factorization.

670187205656509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512000, while the sum is 67.

The spelling of 670187205656509 in words is "six hundred seventy trillion, one hundred eighty-seven billion, two hundred five million, six hundred fifty-six thousand, five hundred nine".