665213505312566 has 32 divisors (see below), whose sum is σ = 1200582027889920. Its totient is φ = 270042416460000.

The previous prime is 665213505312497. The next prime is 665213505312641.

665213505312566 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203327360 + ... + 206573091.

It is an arithmetic number, because the mean of its divisors is an integer number (37518188371560).

Almost surely, 2^{665213505312566} is an apocalyptic number.

665213505312566 is a deficient number, since it is larger than the sum of its proper divisors (535368522577354).

665213505312566 is a wasteful number, since it uses less digits than its factorization.

665213505312566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409906580.

The product of its (nonzero) digits is 29160000, while the sum is 56.

The spelling of 665213505312566 in words is "six hundred sixty-five trillion, two hundred thirteen billion, five hundred five million, three hundred twelve thousand, five hundred sixty-six".