56511065553 has 4 divisors (see below), whose sum is σ = 75348087408. Its totient is φ = 37674043700.

The previous prime is 56511065551. The next prime is 56511065581. The reversal of 56511065553 is 35556011565.

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 56511065553 - 2¹ = 56511065551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56511065551) 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, 9418510923 + ... + 9418510928.

It is an arithmetic number, because the mean of its divisors is an integer number (18837021852).

Almost surely, 2^56511065553 is an apocalyptic number.

It is an amenable number.

56511065553 is a deficient number, since it is larger than the sum of its proper divisors (18837021855).

56511065553 is a wasteful number, since it uses less digits than its factorization.

56511065553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18837021854.

The product of its (nonzero) digits is 337500, while the sum is 42.

The spelling of 56511065553 in words is "fifty-six billion, five hundred eleven million, sixty-five thousand, five hundred fifty-three".