5561778953 has 2 divisors, whose sum is σ = 5561778954. Its totient is φ = 5561778952.

The previous prime is 5561778947. The next prime is 5561779021. The reversal of 5561778953 is 3598771655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3490800889 + 2070978064 = 59083^2 + 45508^2 .

It is a cyclic number.

It is not a de Polignac number, because 5561778953 - 2⁶ = 5561778889 is a prime.

It is not a weakly prime, because it can be changed into another prime (5561778353) 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 as a sum of consecutive naturals, namely, 2780889476 + 2780889477.

It is an arithmetic number, because the mean of its divisors is an integer number (2780889477).

Almost surely, 2^5561778953 is an apocalyptic number.

It is an amenable number.

5561778953 is a deficient number, since it is larger than the sum of its proper divisors (1).

5561778953 is an equidigital number, since it uses as much as digits as its factorization.

5561778953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938000, while the sum is 56.

The square root of 5561778953 is about 74577.3353841501. The cubic root of 5561778953 is about 1771.7587031754.

The spelling of 5561778953 in words is "five billion, five hundred sixty-one million, seven hundred seventy-eight thousand, nine hundred fifty-three".