55531324561 has 4 divisors (see below), whose sum is σ = 56234252800. Its totient is φ = 54828396324.

The previous prime is 55531324559. The next prime is 55531324577. The reversal of 55531324561 is 16542313555.

It is a happy number.

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 not a de Polignac number, because 55531324561 - 2¹ = 55531324559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55531324531) 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, 351464001 + ... + 351464158.

It is an arithmetic number, because the mean of its divisors is an integer number (14058563200).

Almost surely, 2^55531324561 is an apocalyptic number.

It is an amenable number.

55531324561 is a deficient number, since it is larger than the sum of its proper divisors (702928239).

55531324561 is an equidigital number, since it uses as much as digits as its factorization.

55531324561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702928238.

The product of its digits is 270000, while the sum is 40.

The spelling of 55531324561 in words is "fifty-five billion, five hundred thirty-one million, three hundred twenty-four thousand, five hundred sixty-one".