491166720000 has 2240 divisors, whose sum is σ = 2210997254400. Its totient is φ = 106168320000.

The previous prime is 491166719969. The next prime is 491166720013. The reversal of 491166720000 is 27661194.

491166720000 is a `hidden beast` number, since 491 + 166 + 7 + 2 + 0 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 25850879991 + ... + 25850880009.

Almost surely, 2^491166720000 is an apocalyptic number.

491166720000 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 491166720000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1105498627200).

491166720000 is an abundant number, since it is smaller than the sum of its proper divisors (1719830534400).

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

491166720000 is a wasteful number, since it uses less digits than its factorization.

491166720000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 491166720000 in words is "four hundred ninety-one billion, one hundred sixty-six million, seven hundred twenty thousand".