665606066093 has 2 divisors, whose sum is σ = 665606066094. Its totient is φ = 665606066092.

The previous prime is 665606066063. The next prime is 665606066129. The reversal of 665606066093 is 390660606566.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 537497192164 + 128108873929 = 733142^2 + 357923^2 .

It is a cyclic number.

It is not a de Polignac number, because 665606066093 - 2³⁶ = 596886589357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665606066053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332803033046 + 332803033047.

It is an arithmetic number, because the mean of its divisors is an integer number (332803033047).

Almost surely, 2^665606066093 is an apocalyptic number.

It is an amenable number.

665606066093 is a deficient number, since it is larger than the sum of its proper divisors (1).

665606066093 is an equidigital number, since it uses as much as digits as its factorization.

665606066093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6298560, while the sum is 53.

The spelling of 665606066093 in words is "six hundred sixty-five billion, six hundred six million, sixty-six thousand, ninety-three".