55120520450020 has 48 divisors (see below), whose sum is σ = 115868291051520. Its totient is φ = 22026268750464.

The previous prime is 55120520449979. The next prime is 55120520450041. The reversal of 55120520450020 is 2005402502155.

It is a happy number.

55120520450020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312728757 + ... + 312904963.

It is an arithmetic number, because the mean of its divisors is an integer number (2413922730240).

Almost surely, 2^{55120520450020} is an apocalyptic number.

It is an amenable number.

55120520450020 is an abundant number, since it is smaller than the sum of its proper divisors (60747770601500).

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

55120520450020 is a wasteful number, since it uses less digits than its factorization.

55120520450020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191692 (or 191690 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 31.

Adding to 55120520450020 its reverse (2005402502155), we get a palindrome (57125922952175).

The spelling of 55120520450020 in words is "fifty-five trillion, one hundred twenty billion, five hundred twenty million, four hundred fifty thousand, twenty".