1666868367001 has 2 divisors, whose sum is σ = 1666868367002. Its totient is φ = 1666868367000.

The previous prime is 1666868366927. The next prime is 1666868367023. The reversal of 1666868367001 is 1007638686661.

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., 1381621579776 + 285246787225 = 1175424^2 + 534085^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666868367001 - 2³³ = 1658278432409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666868367071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833434183500 + 833434183501.

It is an arithmetic number, because the mean of its divisors is an integer number (833434183501).

Almost surely, 2^{1666868367001} is an apocalyptic number.

It is an amenable number.

1666868367001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666868367001 is an equidigital number, since it uses as much as digits as its factorization.

1666868367001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10450944, while the sum is 58.

The spelling of 1666868367001 in words is "one trillion, six hundred sixty-six billion, eight hundred sixty-eight million, three hundred sixty-seven thousand, one".