55881344857 has 4 divisors (see below), whose sum is σ = 60179909860. Its totient is φ = 51582779856.

The previous prime is 55881344843. The next prime is 55881344873. The reversal of 55881344857 is 75844318855.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3886400281 + 51994944576 = 62341^2 + 228024^2 .

It is a cyclic number.

It is not a de Polignac number, because 55881344857 - 2¹¹ = 55881342809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55881344957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2149282482 + ... + 2149282507.

It is an arithmetic number, because the mean of its divisors is an integer number (15044977465).

Almost surely, 2^55881344857 is an apocalyptic number.

It is an amenable number.

55881344857 is a deficient number, since it is larger than the sum of its proper divisors (4298565003).

55881344857 is a wasteful number, since it uses less digits than its factorization.

55881344857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4298565002.

The product of its digits is 21504000, while the sum is 58.

The spelling of 55881344857 in words is "fifty-five billion, eight hundred eighty-one million, three hundred forty-four thousand, eight hundred fifty-seven".