666300635261 has 2 divisors, whose sum is σ = 666300635262. Its totient is φ = 666300635260.

The previous prime is 666300635239. The next prime is 666300635263. The reversal of 666300635261 is 162536003666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 351797265625 + 314503369636 = 593125^2 + 560806^2 .

It is a cyclic number.

It is not a de Polignac number, because 666300635261 - 2²⁶ = 666233526397 is a prime.

Together with 666300635263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666300635263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333150317630 + 333150317631.

It is an arithmetic number, because the mean of its divisors is an integer number (333150317631).

Almost surely, 2^666300635261 is an apocalyptic number.

It is an amenable number.

666300635261 is a deficient number, since it is larger than the sum of its proper divisors (1).

666300635261 is an equidigital number, since it uses as much as digits as its factorization.

666300635261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 44.

The spelling of 666300635261 in words is "six hundred sixty-six billion, three hundred million, six hundred thirty-five thousand, two hundred sixty-one".