556645373 has 2 divisors, whose sum is σ = 556645374. Its totient is φ = 556645372.

The previous prime is 556645307. The next prime is 556645381. The reversal of 556645373 is 373546655.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 443818489 + 112826884 = 21067^2 + 10622^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556645373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556641373) 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 as a sum of consecutive naturals, namely, 278322686 + 278322687.

It is an arithmetic number, because the mean of its divisors is an integer number (278322687).

Almost surely, 2^556645373 is an apocalyptic number.

It is an amenable number.

556645373 is a deficient number, since it is larger than the sum of its proper divisors (1).

556645373 is an equidigital number, since it uses as much as digits as its factorization.

556645373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1134000, while the sum is 44.

The square root of 556645373 is about 23593.3332320806. Note that the first 3 decimals coincide. The cubic root of 556645373 is about 822.6078845191.

The spelling of 556645373 in words is "five hundred fifty-six million, six hundred forty-five thousand, three hundred seventy-three".