1220503441555 has 4 divisors (see below), whose sum is σ = 1464604129872. Its totient is φ = 976402753240.

The previous prime is 1220503441481. The next prime is 1220503441603. The reversal of 1220503441555 is 5551443050221.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1220503441555 - 2⁹ = 1220503441043 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122050344151 + ... + 122050344160.

It is an arithmetic number, because the mean of its divisors is an integer number (366151032468).

Almost surely, 2^{1220503441555} is an apocalyptic number.

1220503441555 is a deficient number, since it is larger than the sum of its proper divisors (244100688317).

1220503441555 is an equidigital number, since it uses as much as digits as its factorization.

1220503441555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244100688316.

The product of its (nonzero) digits is 120000, while the sum is 37.

Adding to 1220503441555 its reverse (5551443050221), we get a palindrome (6771946491776).

The spelling of 1220503441555 in words is "one trillion, two hundred twenty billion, five hundred three million, four hundred forty-one thousand, five hundred fifty-five".