665553545355566 has 8 divisors (see below), whose sum is σ = 1140948934895280. Its totient is φ = 285237233723808.

The previous prime is 665553545355557. The next prime is 665553545355607.

665553545355566 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 = 665553545355493 and 665553545355502.

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, 23769769476971 + ... + 23769769476998.

It is an arithmetic number, because the mean of its divisors is an integer number (142618616861910).

Almost surely, 2^{665553545355566} is an apocalyptic number.

665553545355566 is a deficient number, since it is larger than the sum of its proper divisors (475395389539714).

665553545355566 is a wasteful number, since it uses less digits than its factorization.

665553545355566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47539538953978.

The product of its digits is 18225000000, while the sum is 74.

The spelling of 665553545355566 in words is "six hundred sixty-five trillion, five hundred fifty-three billion, five hundred forty-five million, three hundred fifty-five thousand, five hundred sixty-six".