665642363246566 has 8 divisors (see below), whose sum is σ = 998835689322504. Its totient is φ = 332697133472400.

The previous prime is 665642363246521. The next prime is 665642363246603.

665642363246566 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 665642363246495 and 665642363246504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62024068735 + ... + 62024079466.

It is an arithmetic number, because the mean of its divisors is an integer number (124854461165313).

Almost surely, 2^{665642363246566} is an apocalyptic number.

665642363246566 is a deficient number, since it is larger than the sum of its proper divisors (333193326075938).

665642363246566 is a wasteful number, since it uses less digits than its factorization.

665642363246566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124048150886.

The product of its digits is 4031078400, while the sum is 70.

The spelling of 665642363246566 in words is "six hundred sixty-five trillion, six hundred forty-two billion, three hundred sixty-three million, two hundred forty-six thousand, five hundred sixty-six".