556664999991 has 4 divisors (see below), whose sum is σ = 742219999992. Its totient is φ = 371109999992.

The previous prime is 556664999921. The next prime is 556664999993. The reversal of 556664999991 is 199999466655.

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 556664999991 - 2³⁸ = 281787093047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556664999993) 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, 92777499996 + ... + 92777500001.

It is an arithmetic number, because the mean of its divisors is an integer number (185554999998).

Almost surely, 2^556664999991 is an apocalyptic number.

556664999991 is a deficient number, since it is larger than the sum of its proper divisors (185555000001).

556664999991 is a wasteful number, since it uses less digits than its factorization.

556664999991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185555000000.

The product of its digits is 1275458400, while the sum is 78.

The spelling of 556664999991 in words is "five hundred fifty-six billion, six hundred sixty-four million, nine hundred ninety-nine thousand, nine hundred ninety-one".