1220544155503 has 8 divisors (see below), whose sum is σ = 1262219886080. Its totient is φ = 1179012383640.

The previous prime is 1220544155497. The next prime is 1220544155521. The reversal of 1220544155503 is 3055514450221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1220544155503 - 2¹³ = 1220544147311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220544155533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35972433 + ... + 36006346.

It is an arithmetic number, because the mean of its divisors is an integer number (157777485760).

Almost surely, 2^{1220544155503} is an apocalyptic number.

1220544155503 is a deficient number, since it is larger than the sum of its proper divisors (41675730577).

1220544155503 is an equidigital number, since it uses as much as digits as its factorization.

1220544155503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71979357.

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

The spelling of 1220544155503 in words is "one trillion, two hundred twenty billion, five hundred forty-four million, one hundred fifty-five thousand, five hundred three".