556789999 has 4 divisors (see below), whose sum is σ = 556844320. Its totient is φ = 556735680.

The previous prime is 556789993. The next prime is 556790027. The reversal of 556789999 is 999987655.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 999987655 = 5 ⋅199997531.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556789999 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556789993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6594 + ... + 34015.

It is an arithmetic number, because the mean of its divisors is an integer number (139211080).

Almost surely, 2^556789999 is an apocalyptic number.

556789999 is a deficient number, since it is larger than the sum of its proper divisors (54321).

556789999 is a wasteful number, since it uses less digits than its factorization.

556789999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54320.

The product of its digits is 55112400, while the sum is 67.

The square root of 556789999 is about 23596.3980090182. The cubic root of 556789999 is about 822.6791208883.

The spelling of 556789999 in words is "five hundred fifty-six million, seven hundred eighty-nine thousand, nine hundred ninety-nine".