1220243359543 has 8 divisors (see below), whose sum is σ = 1314432201488. Its totient is φ = 1126100798784.

The previous prime is 1220243359493. The next prime is 1220243359571. The reversal of 1220243359543 is 3459533420221.

It is a happy number.

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

It is not a de Polignac number, because 1220243359543 - 2³³ = 1211653424951 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1220243359543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220243389543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11515521 + ... + 11621002.

It is an arithmetic number, because the mean of its divisors is an integer number (164304025186).

Almost surely, 2^{1220243359543} is an apocalyptic number.

1220243359543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1220243359543 is a deficient number, since it is larger than the sum of its proper divisors (94188841945).

1220243359543 is a wasteful number, since it uses less digits than its factorization.

1220243359543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23140593.

The product of its (nonzero) digits is 777600, while the sum is 43.

Adding to 1220243359543 its reverse (3459533420221), we get a palindrome (4679776779764).

The spelling of 1220243359543 in words is "one trillion, two hundred twenty billion, two hundred forty-three million, three hundred fifty-nine thousand, five hundred forty-three".