5551385779 has 2 divisors, whose sum is σ = 5551385780. Its totient is φ = 5551385778.

The previous prime is 5551385767. The next prime is 5551385831. The reversal of 5551385779 is 9775831555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5551385779 - 2⁹ = 5551385267 is a prime.

It is not a weakly prime, because it can be changed into another prime (5551305779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2775692889 + 2775692890.

It is an arithmetic number, because the mean of its divisors is an integer number (2775692890).

Almost surely, 2^5551385779 is an apocalyptic number.

5551385779 is a deficient number, since it is larger than the sum of its proper divisors (1).

5551385779 is an equidigital number, since it uses as much as digits as its factorization.

5551385779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6615000, while the sum is 55.

The square root of 5551385779 is about 74507.6222879243. The cubic root of 5551385779 is about 1770.6543995204.

The spelling of 5551385779 in words is "five billion, five hundred fifty-one million, three hundred eighty-five thousand, seven hundred seventy-nine".