5555561779 has 16 divisors (see below), whose sum is σ = 5723827200. Its totient is φ = 5390471520.

The previous prime is 5555561777. The next prime is 5555561807. The reversal of 5555561779 is 9771655555.

It is a cyclic number.

It is not a de Polignac number, because 5555561779 - 2¹ = 5555561777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5555561771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1218997 + ... + 1223545.

It is an arithmetic number, because the mean of its divisors is an integer number (357739200).

Almost surely, 2^5555561779 is an apocalyptic number.

5555561779 is a deficient number, since it is larger than the sum of its proper divisors (168265421).

5555561779 is a wasteful number, since it uses less digits than its factorization.

5555561779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4890.

The product of its digits is 8268750, while the sum is 55.

The square root of 5555561779 is about 74535.6409981158. The cubic root of 5555561779 is about 1771.0982766438.

The spelling of 5555561779 in words is "five billion, five hundred fifty-five million, five hundred sixty-one thousand, seven hundred seventy-nine".