491741658666 has 24 divisors (see below), whose sum is σ = 1066079461824. Its totient is φ = 163815547560.

The previous prime is 491741658649. The next prime is 491741658671. The reversal of 491741658666 is 666856147194.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8164050 + ... + 8224061.

It is an arithmetic number, because the mean of its divisors is an integer number (44419977576).

Almost surely, 2^491741658666 is an apocalyptic number.

491741658666 is an abundant number, since it is smaller than the sum of its proper divisors (574337803158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491741658666 is a wasteful number, since it uses less digits than its factorization.

491741658666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16389786 (or 16389783 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 63.

The spelling of 491741658666 in words is "four hundred ninety-one billion, seven hundred forty-one million, six hundred fifty-eight thousand, six hundred sixty-six".