85205563 has 4 divisors (see below), whose sum is σ = 85224400. Its totient is φ = 85186728.

The previous prime is 85205543. The next prime is 85205599. The reversal of 85205563 is 36550258.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85205563 - 2¹⁷ = 85074491 is a prime.

It is a super-2 number, since 2×85205563² = 14519975932293938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85205543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1906 + ... + 13192.

It is an arithmetic number, because the mean of its divisors is an integer number (21306100).

Almost surely, 2^85205563 is an apocalyptic number.

85205563 is a deficient number, since it is larger than the sum of its proper divisors (18837).

85205563 is a wasteful number, since it uses less digits than its factorization.

85205563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18836.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 85205563 is about 9230.6859441755. The cubic root of 85205563 is about 440.0371232452.

The spelling of 85205563 in words is "eighty-five million, two hundred five thousand, five hundred sixty-three".