55641926821 has 8 divisors (see below), whose sum is σ = 60595358040. Its totient is φ = 50784678912.

The previous prime is 55641926779. The next prime is 55641926831. The reversal of 55641926821 is 12862914655.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5214284100 + 50427642721 = 72210^2 + 224561^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55641926821 - 2⁷ = 55641926693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55641926831) 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 7 ways as a sum of consecutive naturals, for example, 24044620 + ... + 24046933.

It is an arithmetic number, because the mean of its divisors is an integer number (7574419755).

Almost surely, 2^55641926821 is an apocalyptic number.

It is an amenable number.

55641926821 is a deficient number, since it is larger than the sum of its proper divisors (4953431219).

55641926821 is a wasteful number, since it uses less digits than its factorization.

55641926821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48091655.

The product of its digits is 1036800, while the sum is 49.

The spelling of 55641926821 in words is "fifty-five billion, six hundred forty-one million, nine hundred twenty-six thousand, eight hundred twenty-one".