55456843821 has 4 divisors (see below), whose sum is σ = 73942458432. Its totient is φ = 36971229212.

The previous prime is 55456843801. The next prime is 55456843831. The reversal of 55456843821 is 12834865455.

55456843821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55456843821 - 2⁵ = 55456843789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55456843801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9242807301 + ... + 9242807306.

It is an arithmetic number, because the mean of its divisors is an integer number (18485614608).

Almost surely, 2^55456843821 is an apocalyptic number.

It is an amenable number.

55456843821 is a deficient number, since it is larger than the sum of its proper divisors (18485614611).

55456843821 is a wasteful number, since it uses less digits than its factorization.

55456843821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18485614610.

The product of its digits is 4608000, while the sum is 51.

The spelling of 55456843821 in words is "fifty-five billion, four hundred fifty-six million, eight hundred forty-three thousand, eight hundred twenty-one".