491818566597120 has 3200 divisors, whose sum is σ = 2120215748935680. Its totient is φ = 106609661706240.

The previous prime is 491818566597107. The next prime is 491818566597133. The reversal of 491818566597120 is 21795665818194.

491818566597120 is a `hidden beast` number, since 4 + 9 + 1 + 8 + 1 + 8 + 5 + 6 + 6 + 597 + 1 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (491818566597107) and next prime (491818566597133).

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

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 508602446877 + ... + 508602447843.

Almost surely, 2^{491818566597120} is an apocalyptic number.

491818566597120 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 491818566597120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060107874467840).

491818566597120 is an abundant number, since it is smaller than the sum of its proper divisors (1628397182338560).

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

491818566597120 is a wasteful number, since it uses less digits than its factorization.

491818566597120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256 (or 1231 counting only the distinct ones).

The product of its (nonzero) digits is 261273600, while the sum is 72.

The spelling of 491818566597120 in words is "four hundred ninety-one trillion, eight hundred eighteen billion, five hundred sixty-six million, five hundred ninety-seven thousand, one hundred twenty".