666069601709 has 2 divisors, whose sum is σ = 666069601710. Its totient is φ = 666069601708.

The previous prime is 666069601649. The next prime is 666069601733. The reversal of 666069601709 is 907106960666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 547382461609 + 118687140100 = 739853^2 + 344510^2 .

It is a cyclic number.

It is not a de Polignac number, because 666069601709 - 2³² = 661774634413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666069601759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333034800854 + 333034800855.

It is an arithmetic number, because the mean of its divisors is an integer number (333034800855).

Almost surely, 2^666069601709 is an apocalyptic number.

It is an amenable number.

666069601709 is a deficient number, since it is larger than the sum of its proper divisors (1).

666069601709 is an equidigital number, since it uses as much as digits as its factorization.

666069601709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4408992, while the sum is 56.

The spelling of 666069601709 in words is "six hundred sixty-six billion, sixty-nine million, six hundred one thousand, seven hundred nine".