1221650546688 has 1216 divisors, whose sum is σ = 4566078397440. Its totient is φ = 317089382400.

The previous prime is 1221650546659. The next prime is 1221650546771. The reversal of 1221650546688 is 8866450561221.

1221650546688 is a `hidden beast` number, since 1 + 2 + 2 + 16 + 5 + 0 + 546 + 6 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17206345693 + ... + 17206345763.

Almost surely, 2^{1221650546688} is an apocalyptic number.

1221650546688 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 1221650546688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2283039198720).

1221650546688 is an abundant number, since it is smaller than the sum of its proper divisors (3344427850752).

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

1221650546688 is an equidigital number, since it uses as much as digits as its factorization.

1221650546688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 54.

The spelling of 1221650546688 in words is "one trillion, two hundred twenty-one billion, six hundred fifty million, five hundred forty-six thousand, six hundred eighty-eight".