556818066541 has 4 divisors (see below), whose sum is σ = 607437890784. Its totient is φ = 506198242300.

The previous prime is 556818066527. The next prime is 556818066557. The reversal of 556818066541 is 145660818655.

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 556818066541 - 2³³ = 548228131949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556818066241) 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, 25309912105 + ... + 25309912126.

It is an arithmetic number, because the mean of its divisors is an integer number (151859472696).

Almost surely, 2^556818066541 is an apocalyptic number.

It is an amenable number.

556818066541 is a deficient number, since it is larger than the sum of its proper divisors (50619824243).

556818066541 is a wasteful number, since it uses less digits than its factorization.

556818066541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50619824242.

The product of its (nonzero) digits is 6912000, while the sum is 55.

The spelling of 556818066541 in words is "five hundred fifty-six billion, eight hundred eighteen million, sixty-six thousand, five hundred forty-one".