55021620243 has 16 divisors (see below), whose sum is σ = 73507150080. Its totient is φ = 36608648736.

The previous prime is 55021620233. The next prime is 55021620259. The reversal of 55021620243 is 34202612055.

55021620243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55021620243 - 2⁸ = 55021619987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55021620243.

It is not an unprimeable number, because it can be changed into a prime (55021620233) 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, 4152553 + ... + 4165781.

It is an arithmetic number, because the mean of its divisors is an integer number (4594196880).

Almost surely, 2^55021620243 is an apocalyptic number.

55021620243 is a deficient number, since it is larger than the sum of its proper divisors (18485529837).

55021620243 is a wasteful number, since it uses less digits than its factorization.

55021620243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15866.

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 55021620243 in words is "fifty-five billion, twenty-one million, six hundred twenty thousand, two hundred forty-three".