55005553 has 2 divisors, whose sum is σ = 55005554.
Its totient is φ = 55005552.
The previous prime is 55005521. The next prime is 55005583. The reversal of 55005553 is 35550055.
55005553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 49660209 + 5345344 = 7047^2 + 2312^2
It is a cyclic number.
It is not a de Polignac number, because 55005553 - 25 = 55005521 is a prime.
It is a super-2 number, since 2×550055532 = 6051221721671618, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (55005583) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27502776 + 27502777.
It is an arithmetic number, because the mean of its divisors is an integer number (27502777).
Almost surely, 255005553 is an apocalyptic number.
It is an amenable number.
55005553 is a deficient number, since it is larger than the sum of its proper divisors (1).
55005553 is an equidigital number, since it uses as much as digits as its factorization.
55005553 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 9375, while the sum is 28.
The square root of 55005553 is about 7416.5728608300.
The cubic root of 55005553 is about 380.3080443091.
The spelling of 55005553 in words is "fifty-five million, five thousand, five hundred fifty-three".