1220520550544 has 80 divisors (see below), whose sum is σ = 2504166865920. Its totient is φ = 575337853440.

The previous prime is 1220520550531. The next prime is 1220520550567. The reversal of 1220520550544 is 4450550250221.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9334322 + ... + 9464174.

It is an arithmetic number, because the mean of its divisors is an integer number (31302085824).

Almost surely, 2^{1220520550544} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220520550544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1252083432960).

1220520550544 is an abundant number, since it is smaller than the sum of its proper divisors (1283646315376).

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

1220520550544 is a wasteful number, since it uses less digits than its factorization.

1220520550544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130368 (or 130362 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 35.

The spelling of 1220520550544 in words is "one trillion, two hundred twenty billion, five hundred twenty million, five hundred fifty thousand, five hundred forty-four".