56554507661 has 4 divisors (see below), whose sum is σ = 56559360924. Its totient is φ = 56549654400.

The previous prime is 56554507657. The next prime is 56554507663. The reversal of 56554507661 is 16670545565.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13570852036 + 42983655625 = 116494^2 + 207325^2 .

It is a cyclic number.

It is not a de Polignac number, because 56554507661 - 2² = 56554507657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56554507663) 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, 2409110 + ... + 2432471.

It is an arithmetic number, because the mean of its divisors is an integer number (14139840231).

Almost surely, 2^56554507661 is an apocalyptic number.

It is an amenable number.

56554507661 is a deficient number, since it is larger than the sum of its proper divisors (4853263).

56554507661 is a wasteful number, since it uses less digits than its factorization.

56554507661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4853262.

The product of its (nonzero) digits is 3780000, while the sum is 50.

The spelling of 56554507661 in words is "fifty-six billion, five hundred fifty-four million, five hundred seven thousand, six hundred sixty-one".