1220909324544 has 2016 divisors, whose sum is σ = 4849230731520. Its totient is φ = 297977315328.

The previous prime is 1220909324527. The next prime is 1220909324549. The reversal of 1220909324544 is 4454239090221.

1220909324544 is a `hidden beast` number, since 1 + 2 + 20 + 90 + 93 + 2 + 454 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (2016).

It is a self number, because there is not a number n which added to its sum of digits gives 1220909324544.

It is not an unprimeable number, because it can be changed into a prime (1220909324549) by changing a digit.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 18222527199 + ... + 18222527265.

Almost surely, 2^{1220909324544} is an apocalyptic number.

1220909324544 is a gapful number since it is divisible by the number (14) 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 1220909324544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2424615365760).

1220909324544 is an abundant number, since it is smaller than the sum of its proper divisors (3628321406976).

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

1220909324544 is an equidigital number, since it uses as much as digits as its factorization.

1220909324544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 1220909324544 in words is "one trillion, two hundred twenty billion, nine hundred nine million, three hundred twenty-four thousand, five hundred forty-four".