55505007773 has 2 divisors, whose sum is σ = 55505007774. Its totient is φ = 55505007772.

The previous prime is 55505007673. The next prime is 55505007787. The reversal of 55505007773 is 37770050555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55291760164 + 213247609 = 235142^2 + 14603^2 .

It is a cyclic number.

It is not a de Polignac number, because 55505007773 - 2¹⁶ = 55504942237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55505007793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27752503886 + 27752503887.

It is an arithmetic number, because the mean of its divisors is an integer number (27752503887).

Almost surely, 2^55505007773 is an apocalyptic number.

It is an amenable number.

55505007773 is a deficient number, since it is larger than the sum of its proper divisors (1).

55505007773 is an equidigital number, since it uses as much as digits as its factorization.

55505007773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 643125, while the sum is 44.

The spelling of 55505007773 in words is "fifty-five billion, five hundred five million, seven thousand, seven hundred seventy-three".