1220543550055 has 32 divisors (see below), whose sum is σ = 1599558689664. Its totient is φ = 890321596416.

The previous prime is 1220543550049. The next prime is 1220543550059. The reversal of 1220543550055 is 5500553450221.

It is a cyclic number.

It is not a de Polignac number, because 1220543550055 - 2⁹ = 1220543549543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220543549996 and 1220543550023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220543550059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100027 + ... + 1565596.

It is an arithmetic number, because the mean of its divisors is an integer number (49986209052).

Almost surely, 2^{1220543550055} is an apocalyptic number.

1220543550055 is a deficient number, since it is larger than the sum of its proper divisors (379015139609).

1220543550055 is a wasteful number, since it uses less digits than its factorization.

1220543550055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665915.

The product of its (nonzero) digits is 150000, while the sum is 37.

The spelling of 1220543550055 in words is "one trillion, two hundred twenty billion, five hundred forty-three million, five hundred fifty thousand, fifty-five".