55215220424 has 64 divisors (see below), whose sum is σ = 127450713600. Its totient is φ = 21838074624.

The previous prime is 55215220421. The next prime is 55215220441. The reversal of 55215220424 is 42402251255.

55215220424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (55215220421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4505297 + ... + 4517535.

It is an arithmetic number, because the mean of its divisors is an integer number (1991417400).

Almost surely, 2^55215220424 is an apocalyptic number.

It is an amenable number.

55215220424 is an abundant number, since it is smaller than the sum of its proper divisors (72235493176).

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

55215220424 is a wasteful number, since it uses less digits than its factorization.

55215220424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18462 (or 18458 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 32.

Adding to 55215220424 its reverse (42402251255), we get a palindrome (97617471679).

The spelling of 55215220424 in words is "fifty-five billion, two hundred fifteen million, two hundred twenty thousand, four hundred twenty-four".