556016399 has 16 divisors (see below), whose sum is σ = 628224480. Its totient is φ = 488954880.

The previous prime is 556016393. The next prime is 556016429. The reversal of 556016399 is 993610655.

It is a Cunningham number, because it is equal to 23580²-1.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556016399 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 (556016393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11789 + ... + 35369.

It is an arithmetic number, because the mean of its divisors is an integer number (39264030).

Almost surely, 2^556016399 is an apocalyptic number.

556016399 is a deficient number, since it is larger than the sum of its proper divisors (72208081).

556016399 is a wasteful number, since it uses less digits than its factorization.

556016399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23690.

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 556016399 is about 23579.9999787956. Note that the first 4 decimals coincide. The cubic root of 556016399 is about 822.2979361539.

The spelling of 556016399 in words is "five hundred fifty-six million, sixteen thousand, three hundred ninety-nine".