491466574656 has 672 divisors, whose sum is σ = 1612284710400. Its totient is φ = 147828602880.

The previous prime is 491466574633. The next prime is 491466574679. The reversal of 491466574656 is 656475664194.

491466574656 is a `hidden beast` number, since 4 + 9 + 1 + 4 + 6 + 6 + 574 + 6 + 56 = 666.

It is an interprime number because it is at equal distance from previous prime (491466574633) and next prime (491466574679).

It is a junction number, because it is equal to n+sod(n) for n = 491466574593 and 491466574602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 711239271 + ... + 711239961.

It is an arithmetic number, because the mean of its divisors is an integer number (2399233200).

Almost surely, 2^491466574656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491466574656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806142355200).

491466574656 is an abundant number, since it is smaller than the sum of its proper divisors (1120818135744).

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

491466574656 is a wasteful number, since it uses less digits than its factorization.

491466574656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 827 counting only the distinct ones).

The product of its digits is 130636800, while the sum is 63.

The spelling of 491466574656 in words is "four hundred ninety-one billion, four hundred sixty-six million, five hundred seventy-four thousand, six hundred fifty-six".