6666645861101 has 2 divisors, whose sum is σ = 6666645861102. Its totient is φ = 6666645861100.

The previous prime is 6666645861061. The next prime is 6666645861137. The reversal of 6666645861101 is 1011685466666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6485426222500 + 181219638601 = 2546650^2 + 425699^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666645861101 - 2¹⁸ = 6666645598957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666645861191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333322930550 + 3333322930551.

It is an arithmetic number, because the mean of its divisors is an integer number (3333322930551).

Almost surely, 2^{6666645861101} is an apocalyptic number.

It is an amenable number.

6666645861101 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666645861101 is an equidigital number, since it uses as much as digits as its factorization.

6666645861101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 6666645861101 in words is "six trillion, six hundred sixty-six billion, six hundred forty-five million, eight hundred sixty-one thousand, one hundred one".