1491897286656 has 864 divisors, whose sum is σ = 5345703941760. Its totient is φ = 391378894848.

The previous prime is 1491897286639. The next prime is 1491897286679. The reversal of 1491897286656 is 6566827981941.

1491897286656 is a `hidden beast` number, since 1 + 491 + 8 + 9 + 7 + 2 + 86 + 6 + 56 = 666.

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

Its product of digits (313528320) is a multiple of the sum of its prime factors (360).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5805047680 + ... + 5805047936.

It is an arithmetic number, because the mean of its divisors is an integer number (6187157340).

Almost surely, 2^{1491897286656} is an apocalyptic number.

1491897286656 is a gapful number since it is divisible by the number (16) 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 1491897286656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2672851970880).

1491897286656 is an abundant number, since it is smaller than the sum of its proper divisors (3853806655104).

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

1491897286656 is an equidigital number, since it uses as much as digits as its factorization.

1491897286656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 325 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 72.

The spelling of 1491897286656 in words is "one trillion, four hundred ninety-one billion, eight hundred ninety-seven million, two hundred eighty-six thousand, six hundred fifty-six".