55066321 has 4 divisors (see below), whose sum is σ = 56409444. Its totient is φ = 53723200.

The previous prime is 55066303. The next prime is 55066339. The reversal of 55066321 is 12366055.

55066321 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.

It is an interprime number because it is at equal distance from previous prime (55066303) and next prime (55066339).

It can be written as a sum of positive squares in 2 ways, for example, as 18584721 + 36481600 = 4311^2 + 6040^2 .

It is a cyclic number.

It is not a de Polignac number, because 55066321 - 2¹⁷ = 54935249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55066321.

It is not an unprimeable number, because it can be changed into a prime (55066391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671500 + ... + 671581.

It is an arithmetic number, because the mean of its divisors is an integer number (14102361).

Almost surely, 2^55066321 is an apocalyptic number.

It is an amenable number.

55066321 is a deficient number, since it is larger than the sum of its proper divisors (1343123).

55066321 is a wasteful number, since it uses less digits than its factorization.

55066321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343122.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 55066321 is about 7420.6685008832. The cubic root of 55066321 is about 380.4480426223.

The spelling of 55066321 in words is "fifty-five million, sixty-six thousand, three hundred twenty-one".