6559779557 has 4 divisors (see below), whose sum is σ = 6621086016. Its totient is φ = 6498473100.

The previous prime is 6559779547. The next prime is 6559779571. The reversal of 6559779557 is 7559779556.

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 6559779557 - 2⁶ = 6559779493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6559779493 and 6559779502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6559779547) 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, 30653069 + ... + 30653282.

It is an arithmetic number, because the mean of its divisors is an integer number (1655271504).

Almost surely, 2^6559779557 is an apocalyptic number.

It is an amenable number.

6559779557 is a deficient number, since it is larger than the sum of its proper divisors (61306459).

6559779557 is a wasteful number, since it uses less digits than its factorization.

6559779557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61306458.

The product of its digits is 104186250, while the sum is 65.

The square root of 6559779557 is about 80992.4660508618. The cubic root of 6559779557 is about 1871.9593556454.

Subtracting 6559779557 from its reverse (7559779556), we obtain a palindrome (999999999).

The spelling of 6559779557 in words is "six billion, five hundred fifty-nine million, seven hundred seventy-nine thousand, five hundred fifty-seven".