556511100491 has 4 divisors (see below), whose sum is σ = 557510223312. Its totient is φ = 555511977672.

The previous prime is 556511100443. The next prime is 556511100529. The reversal of 556511100491 is 194001115655.

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

It is a cyclic number.

It is not a de Polignac number, because 556511100491 - 2⁶ = 556511100427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556511120491) 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, 499560575 + ... + 499561688.

It is an arithmetic number, because the mean of its divisors is an integer number (139377555828).

Almost surely, 2^556511100491 is an apocalyptic number.

556511100491 is a deficient number, since it is larger than the sum of its proper divisors (999122821).

556511100491 is an equidigital number, since it uses as much as digits as its factorization.

556511100491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999122820.

The product of its (nonzero) digits is 27000, while the sum is 38.

The spelling of 556511100491 in words is "five hundred fifty-six billion, five hundred eleven million, one hundred thousand, four hundred ninety-one".