55288553921 has 4 divisors (see below), whose sum is σ = 55289204052. Its totient is φ = 55287903792.

The previous prime is 55288553867. The next prime is 55288553951. The reversal of 55288553921 is 12935588255.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 26782959025 + 28505594896 = 163655^2 + 168836^2 .

It is a cyclic number.

It is not a de Polignac number, because 55288553921 - 2¹⁸ = 55288291777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55288553951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174146 + ... + 375371.

It is an arithmetic number, because the mean of its divisors is an integer number (13822301013).

Almost surely, 2^55288553921 is an apocalyptic number.

It is an amenable number.

55288553921 is a deficient number, since it is larger than the sum of its proper divisors (650131).

55288553921 is a wasteful number, since it uses less digits than its factorization.

55288553921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650130.

The product of its digits is 4320000, while the sum is 53.

The spelling of 55288553921 in words is "fifty-five billion, two hundred eighty-eight million, five hundred fifty-three thousand, nine hundred twenty-one".