491655566 has 8 divisors (see below), whose sum is σ = 737914104. Its totient is φ = 245684200.

The previous prime is 491655557. The next prime is 491655601. The reversal of 491655566 is 665556194.

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

It is a self number, because there is not a number n which added to its sum of digits gives 491655566.

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, 67460 + ... + 74391.

It is an arithmetic number, because the mean of its divisors is an integer number (92239263).

Almost surely, 2^491655566 is an apocalyptic number.

491655566 is a deficient number, since it is larger than the sum of its proper divisors (246258538).

491655566 is a wasteful number, since it uses less digits than its factorization.

491655566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143586.

The product of its digits is 972000, while the sum is 47.

The square root of 491655566 is about 22173.3075115103. The cubic root of 491655566 is about 789.2604123476.

The spelling of 491655566 in words is "four hundred ninety-one million, six hundred fifty-five thousand, five hundred sixty-six".