1220520550543 has 4 divisors (see below), whose sum is σ = 1394880629200. Its totient is φ = 1046160471888.

The previous prime is 1220520550531. The next prime is 1220520550567. The reversal of 1220520550543 is 3450550250221.

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

It is not a de Polignac number, because 1220520550543 - 2²¹ = 1220518453391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220520550499 and 1220520550508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220520554543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87180039318 + ... + 87180039331.

It is an arithmetic number, because the mean of its divisors is an integer number (348720157300).

Almost surely, 2^{1220520550543} is an apocalyptic number.

1220520550543 is a deficient number, since it is larger than the sum of its proper divisors (174360078657).

1220520550543 is an equidigital number, since it uses as much as digits as its factorization.

1220520550543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174360078656.

The product of its (nonzero) digits is 60000, while the sum is 34.

The spelling of 1220520550543 in words is "one trillion, two hundred twenty billion, five hundred twenty million, five hundred fifty thousand, five hundred forty-three".