1220243359544 has 24 divisors (see below), whose sum is σ = 2514861058080. Its totient is φ = 554656072080.

The previous prime is 1220243359493. The next prime is 1220243359571. The reversal of 1220243359544 is 4459533420221.

It is a super-2 number, since 2×1220243359544² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 1220243359495 and 1220243359504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 630290024 + ... + 630291959.

It is an arithmetic number, because the mean of its divisors is an integer number (104785877420).

Almost surely, 2^{1220243359544} is an apocalyptic number.

It is an amenable number.

1220243359544 is an abundant number, since it is smaller than the sum of its proper divisors (1294617698536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1220243359544 is a wasteful number, since it uses less digits than its factorization.

1220243359544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260582011 (or 1260581996 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

Adding to 1220243359544 its reverse (4459533420221), we get a palindrome (5679776779765).

The spelling of 1220243359544 in words is "one trillion, two hundred twenty billion, two hundred forty-three million, three hundred fifty-nine thousand, five hundred forty-four".