491351664 has 20 divisors (see below), whose sum is σ = 1269325256. Its totient is φ = 163783872.

The previous prime is 491351633. The next prime is 491351671. The reversal of 491351664 is 466153194.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 5118199 + ... + 5118294.

Almost surely, 2^491351664 is an apocalyptic number.

It is an amenable number.

491351664 is an abundant number, since it is smaller than the sum of its proper divisors (777973592).

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

491351664 is a wasteful number, since it uses less digits than its factorization.

491351664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10236504 (or 10236498 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 491351664 is about 22166.4535729106. The cubic root of 491351664 is about 789.0977596888.

The spelling of 491351664 in words is "four hundred ninety-one million, three hundred fifty-one thousand, six hundred sixty-four".