1222156985280 has 1792 divisors, whose sum is σ = 5278741954560. Its totient is φ = 232139980800.

The previous prime is 1222156985209. The next prime is 1222156985281. The reversal of 1222156985280 is 825896512221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222156985281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 3522066067 + ... + 3522066413.

Almost surely, 2^{1222156985280} is an apocalyptic number.

1222156985280 is a gapful number since it is divisible by the number (10) 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 1222156985280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2639370977280).

1222156985280 is an abundant number, since it is smaller than the sum of its proper divisors (4056584969280).

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

1222156985280 is a wasteful number, since it uses less digits than its factorization.

1222156985280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 51.

The spelling of 1222156985280 in words is "one trillion, two hundred twenty-two billion, one hundred fifty-six million, nine hundred eighty-five thousand, two hundred eighty".