665642727246566 has 16 divisors (see below), whose sum is σ = 1001233367982144. Its totient is φ = 331899365614824.

The previous prime is 665642727246529. The next prime is 665642727246583.

665642727246566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665642727246493 and 665642727246502.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272373236 + ... + 274806231.

It is an arithmetic number, because the mean of its divisors is an integer number (62577085498884).

Almost surely, 2^{665642727246566} is an apocalyptic number.

665642727246566 is a deficient number, since it is larger than the sum of its proper divisors (335590640735578).

665642727246566 is a wasteful number, since it uses less digits than its factorization.

665642727246566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547181155.

The product of its digits is 7315660800, while the sum is 74.

The spelling of 665642727246566 in words is "six hundred sixty-five trillion, six hundred forty-two billion, seven hundred twenty-seven million, two hundred forty-six thousand, five hundred sixty-six".