491254377984 has 400 divisors, whose sum is σ = 1581928915248. Its totient is φ = 151199612928.

The previous prime is 491254377983. The next prime is 491254377997. The reversal of 491254377984 is 489773452194.

491254377984 is a `hidden beast` number, since 4 + 9 + 1 + 2 + 543 + 7 + 7 + 9 + 84 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491254377983) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 37359699 + ... + 37372845.

Almost surely, 2^491254377984 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 491254377984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790964457624).

491254377984 is an abundant number, since it is smaller than the sum of its proper divisors (1090674537264).

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

491254377984 is a wasteful number, since it uses less digits than its factorization.

491254377984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13247 (or 13222 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The spelling of 491254377984 in words is "four hundred ninety-one billion, two hundred fifty-four million, three hundred seventy-seven thousand, nine hundred eighty-four".