666466365601 has 2 divisors, whose sum is σ = 666466365602. Its totient is φ = 666466365600.

The previous prime is 666466365553. The next prime is 666466365619. The reversal of 666466365601 is 106563664666.

666466365601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 600315040000 + 66151325601 = 774800^2 + 257199^2 .

It is a cyclic number.

It is not a de Polignac number, because 666466365601 - 2³⁵ = 632106627233 is a prime.

It is not a weakly prime, because it can be changed into another prime (666466365001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333233182800 + 333233182801.

It is an arithmetic number, because the mean of its divisors is an integer number (333233182801).

Almost surely, 2^666466365601 is an apocalyptic number.

It is an amenable number.

666466365601 is a deficient number, since it is larger than the sum of its proper divisors (1).

666466365601 is an equidigital number, since it uses as much as digits as its factorization.

666466365601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16796160, while the sum is 55.

The spelling of 666466365601 in words is "six hundred sixty-six billion, four hundred sixty-six million, three hundred sixty-five thousand, six hundred one".