491526463680 has 896 divisors, whose sum is σ = 2056058880000. Its totient is φ = 110466478080.

The previous prime is 491526463639. The next prime is 491526463697. The reversal of 491526463680 is 86364625194.

491526463680 is a `hidden beast` number, since 4 + 9 + 1 + 526 + 4 + 6 + 36 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 180773361 + ... + 180776079.

Almost surely, 2^491526463680 is an apocalyptic number.

491526463680 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 491526463680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1028029440000).

491526463680 is an abundant number, since it is smaller than the sum of its proper divisors (1564532416320).

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

491526463680 is a wasteful number, since it uses less digits than its factorization.

491526463680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827 (or 2797 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 54.

The spelling of 491526463680 in words is "four hundred ninety-one billion, five hundred twenty-six million, four hundred sixty-three thousand, six hundred eighty".