667420686797 has 2 divisors, whose sum is σ = 667420686798. Its totient is φ = 667420686796.

The previous prime is 667420686781. The next prime is 667420686839. The reversal of 667420686797 is 797686024766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599580754276 + 67839932521 = 774326^2 + 260461^2 .

It is a cyclic number.

It is not a de Polignac number, because 667420686797 - 2⁴ = 667420686781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667420686727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333710343398 + 333710343399.

It is an arithmetic number, because the mean of its divisors is an integer number (333710343399).

Almost surely, 2^667420686797 is an apocalyptic number.

It is an amenable number.

667420686797 is a deficient number, since it is larger than the sum of its proper divisors (1).

667420686797 is an equidigital number, since it uses as much as digits as its factorization.

667420686797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256048128, while the sum is 68.

The spelling of 667420686797 in words is "six hundred sixty-seven billion, four hundred twenty million, six hundred eighty-six thousand, seven hundred ninety-seven".