55320033521 has 4 divisors (see below), whose sum is σ = 55375521012. Its totient is φ = 55264546032.

The previous prime is 55320033497. The next prime is 55320033529. The reversal of 55320033521 is 12533002355.

55320033521 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 can be written as a sum of positive squares in 2 ways, for example, as 50193473521 + 5126560000 = 224039^2 + 71600^2 .

It is a cyclic number.

It is not a de Polignac number, because 55320033521 - 2¹⁰ = 55320032497 is a prime.

It is a super-2 number, since 2×55320033521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55320033529) 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, 27742250 + ... + 27744243.

It is an arithmetic number, because the mean of its divisors is an integer number (13843880253).

Almost surely, 2^55320033521 is an apocalyptic number.

It is an amenable number.

55320033521 is a deficient number, since it is larger than the sum of its proper divisors (55487491).

55320033521 is an equidigital number, since it uses as much as digits as its factorization.

55320033521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55487490.

The product of its (nonzero) digits is 13500, while the sum is 29.

Adding to 55320033521 its reverse (12533002355), we get a palindrome (67853035876).

The spelling of 55320033521 in words is "fifty-five billion, three hundred twenty million, thirty-three thousand, five hundred twenty-one".