805505553 has 10 divisors (see below), whose sum is σ = 1203286194. Its totient is φ = 537003648.

The previous prime is 805505539. The next prime is 805505573. The reversal of 805505553 is 355505508.

805505553 is a `hidden beast` number, since 8 + 0 + 550 + 55 + 53 = 666.

It can be written as a sum of positive squares in only one way, i.e., 804743424 + 762129 = 28368^2 + 873^2 .

It is not a de Polignac number, because 805505553 - 2⁵ = 805505521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (805505573) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4972176 + ... + 4972337.

Almost surely, 2^805505553 is an apocalyptic number.

It is an amenable number.

805505553 is a deficient number, since it is larger than the sum of its proper divisors (397780641).

805505553 is an equidigital number, since it uses as much as digits as its factorization.

805505553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9944525 (or 9944516 counting only the distinct ones).

The product of its (nonzero) digits is 75000, while the sum is 36.

The square root of 805505553 is about 28381.4297208580. The cubic root of 805505553 is about 930.4424429625.

The spelling of 805505553 in words is "eight hundred five million, five hundred five thousand, five hundred fifty-three".