491639673515760 has 3200 divisors, whose sum is σ = 2227764728217600. Its totient is φ = 97512284160000.

The previous prime is 491639673515747. The next prime is 491639673515813. The reversal of 491639673515760 is 67515376936194.

491639673515760 is a `hidden beast` number, since 4 + 9 + 1 + 6 + 39 + 6 + 7 + 3 + 515 + 76 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 639 ways as a sum of consecutive naturals, for example, 607712822236 + ... + 607712823044.

It is an arithmetic number, because the mean of its divisors is an integer number (696176477568).

Almost surely, 2^{491639673515760} is an apocalyptic number.

491639673515760 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 491639673515760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1113882364108800).

491639673515760 is an abundant number, since it is smaller than the sum of its proper divisors (1736125054701840).

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

491639673515760 is a wasteful number, since it uses less digits than its factorization.

491639673515760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373 (or 1358 counting only the distinct ones).

The product of its (nonzero) digits is 771573600, while the sum is 72.

The spelling of 491639673515760 in words is "four hundred ninety-one trillion, six hundred thirty-nine billion, six hundred seventy-three million, five hundred fifteen thousand, seven hundred sixty".