55055145521 has 4 divisors (see below), whose sum is σ = 55055633472. Its totient is φ = 55054657572.

The previous prime is 55055145511. The next prime is 55055145557. The reversal of 55055145521 is 12554155055.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 55055145521 - 2¹⁰ = 55055144497 is a prime.

It is a super-2 number, since 2×55055145521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55055145511) 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, 21716 + ... + 332538.

It is an arithmetic number, because the mean of its divisors is an integer number (13763908368).

Almost surely, 2^55055145521 is an apocalyptic number.

It is an amenable number.

55055145521 is a deficient number, since it is larger than the sum of its proper divisors (487951).

55055145521 is a wasteful number, since it uses less digits than its factorization.

55055145521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487950.

The product of its (nonzero) digits is 125000, while the sum is 38.

The spelling of 55055145521 in words is "fifty-five billion, fifty-five million, one hundred forty-five thousand, five hundred twenty-one".