55538335220520 has 64 divisors (see below), whose sum is σ = 167612700366720. Its totient is φ = 14721538751744.

The previous prime is 55538335220513. The next prime is 55538335220549. The reversal of 55538335220520 is 2502253383555.

It is a self number, because there is not a number n which added to its sum of digits gives 55538335220520.

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, 1385666967 + ... + 1385707046.

It is an arithmetic number, because the mean of its divisors is an integer number (2618948443230).

Almost surely, 2^{55538335220520} is an apocalyptic number.

It is an amenable number.

55538335220520 is an abundant number, since it is smaller than the sum of its proper divisors (112074365146200).

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

55538335220520 is a wasteful number, since it uses less digits than its factorization.

55538335220520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771374194 (or 2771374190 counting only the distinct ones).

The product of its (nonzero) digits is 5400000, while the sum is 48.

The spelling of 55538335220520 in words is "fifty-five trillion, five hundred thirty-eight billion, three hundred thirty-five million, two hundred twenty thousand, five hundred twenty".