55405532789 has 2 divisors, whose sum is σ = 55405532790. Its totient is φ = 55405532788.

The previous prime is 55405532729. The next prime is 55405532801. The reversal of 55405532789 is 98723550455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49046746225 + 6358786564 = 221465^2 + 79742^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55405532789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55405532789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55405532729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27702766394 + 27702766395.

It is an arithmetic number, because the mean of its divisors is an integer number (27702766395).

Almost surely, 2^55405532789 is an apocalyptic number.

It is an amenable number.

55405532789 is a deficient number, since it is larger than the sum of its proper divisors (1).

55405532789 is an equidigital number, since it uses as much as digits as its factorization.

55405532789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560000, while the sum is 53.

The spelling of 55405532789 in words is "fifty-five billion, four hundred five million, five hundred thirty-two thousand, seven hundred eighty-nine".