55503010321220 has 192 divisors, whose sum is σ = 145486363631616. Its totient is φ = 17279485816320.

The previous prime is 55503010321201. The next prime is 55503010321223. The reversal of 55503010321220 is 2212301030555.

It is not an unprimeable number, because it can be changed into a prime (55503010321223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7694854334 + ... + 7694861546.

It is an arithmetic number, because the mean of its divisors is an integer number (757741477248).

Almost surely, 2^{55503010321220} 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 55503010321220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72743181815808).

55503010321220 is an abundant number, since it is smaller than the sum of its proper divisors (89983353310396).

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

55503010321220 is a wasteful number, since it uses less digits than its factorization.

55503010321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12370 (or 12368 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 55503010321220 its reverse (2212301030555), we get a palindrome (57715311351775).

The spelling of 55503010321220 in words is "fifty-five trillion, five hundred three billion, ten million, three hundred twenty-one thousand, two hundred twenty".