1646326772928 has 168 divisors, whose sum is σ = 4929399073872. Its totient is φ = 544769224704.

The previous prime is 1646326772927. The next prime is 1646326772939. The reversal of 1646326772928 is 8292776236461.

1646326772928 is a `hidden beast` number, since 16 + 4 + 6 + 326 + 7 + 7 + 292 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1646326772927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1744276 + ... + 2516972.

It is an arithmetic number, because the mean of its divisors is an integer number (29341661154).

Almost surely, 2^{1646326772928} is an apocalyptic number.

1646326772928 is a gapful number since it is divisible by the number (18) 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 1646326772928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2464699536936).

1646326772928 is an abundant number, since it is smaller than the sum of its proper divisors (3283072300944).

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

1646326772928 is an equidigital number, since it uses as much as digits as its factorization.

1646326772928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772861 (or 772839 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 63.

The spelling of 1646326772928 in words is "one trillion, six hundred forty-six billion, three hundred twenty-six million, seven hundred seventy-two thousand, nine hundred twenty-eight".