55784447869 has 2 divisors, whose sum is σ = 55784447870. Its totient is φ = 55784447868.

The previous prime is 55784447813. The next prime is 55784447891. The reversal of 55784447869 is 96874448755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28371022969 + 27413424900 = 168437^2 + 165570^2 .

It is a cyclic number.

It is not a de Polignac number, because 55784447869 - 2¹³ = 55784439677 is a prime.

It is a super-2 number, since 2×55784447869² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55784447809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27892223934 + 27892223935.

It is an arithmetic number, because the mean of its divisors is an integer number (27892223935).

Almost surely, 2^55784447869 is an apocalyptic number.

It is an amenable number.

55784447869 is a deficient number, since it is larger than the sum of its proper divisors (1).

55784447869 is an equidigital number, since it uses as much as digits as its factorization.

55784447869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270950400, while the sum is 67.

The spelling of 55784447869 in words is "fifty-five billion, seven hundred eighty-four million, four hundred forty-seven thousand, eight hundred sixty-nine".