1220444045555 has 16 divisors (see below), whose sum is σ = 1673796705984. Its totient is φ = 836853480960.

The previous prime is 1220444045543. The next prime is 1220444045609. The reversal of 1220444045555 is 5555404440221.

It is not a de Polignac number, because 1220444045555 - 2⁴ = 1220444045539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 914279 + ... + 1810191.

It is an arithmetic number, because the mean of its divisors is an integer number (104612294124).

Almost surely, 2^{1220444045555} is an apocalyptic number.

1220444045555 is a deficient number, since it is larger than the sum of its proper divisors (453352660429).

1220444045555 is an equidigital number, since it uses as much as digits as its factorization.

1220444045555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934846.

The product of its (nonzero) digits is 640000, while the sum is 41.

Adding to 1220444045555 its reverse (5555404440221), we get a palindrome (6775848485776).

The spelling of 1220444045555 in words is "one trillion, two hundred twenty billion, four hundred forty-four million, forty-five thousand, five hundred fifty-five".