556777801 has 2 divisors, whose sum is σ = 556777802. Its totient is φ = 556777800.

The previous prime is 556777799. The next prime is 556777831. The reversal of 556777801 is 108777655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 548683776 + 8094025 = 23424^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 556777801 - 2¹ = 556777799 is a prime.

Together with 556777799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (556777831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278388900 + 278388901.

It is an arithmetic number, because the mean of its divisors is an integer number (278388901).

Almost surely, 2^556777801 is an apocalyptic number.

It is an amenable number.

556777801 is a deficient number, since it is larger than the sum of its proper divisors (1).

556777801 is an equidigital number, since it uses as much as digits as its factorization.

556777801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 411600, while the sum is 46.

The square root of 556777801 is about 23596.1395359495. The cubic root of 556777801 is about 822.6731131695.

The spelling of 556777801 in words is "five hundred fifty-six million, seven hundred seventy-seven thousand, eight hundred one".