55305552521 has 4 divisors (see below), whose sum is σ = 55406660112. Its totient is φ = 55204444932.

The previous prime is 55305552503. The next prime is 55305552529. The reversal of 55305552521 is 12525550355.

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 a de Polignac number, because none of the positive numbers 2^k-55305552521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55305552529) 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, 50552975 + ... + 50554068.

It is an arithmetic number, because the mean of its divisors is an integer number (13851665028).

Almost surely, 2^55305552521 is an apocalyptic number.

It is an amenable number.

55305552521 is a deficient number, since it is larger than the sum of its proper divisors (101107591).

55305552521 is a wasteful number, since it uses less digits than its factorization.

55305552521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101107590.

The product of its (nonzero) digits is 187500, while the sum is 38.

The spelling of 55305552521 in words is "fifty-five billion, three hundred five million, five hundred fifty-two thousand, five hundred twenty-one".